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  1. By: Holmes, A. F. (Andrew Fernando),
    Holding Institution: New York Botanical Garden, LuEsther T. Mertz Library
    Subjects: Botanical specimens  Bryophytes  Correspondence  Daubeny, Charles, 1795-1867  De Kay, James E. (James Ellsworth), 1792-1851  Geological specimens  Greville, Robert Kaye, 1794-1866  Holmes, A. F. (Andrew Fernando), 1797-1860  Macrae, W. F. (William Frederick)  McGill University  Minerals  Pyrola asarifolia  Saint Charles, Battle of, Saint-Charles-sur-Richel  Saint-Denis, Battle of, Saint-Denis, Saint-Hyacint  Torrey, John, 1796-1873  
    BHL Collections: John Torrey Papers | New York Botanical Garden
  2. By: Schilling, Samuel,
    Publication info: Breslau, Verlag von Heinrich Richter, 1841
    Holding Institution: Harvard University Botany Libraries
    Subjects: Classification  Minerals  Plants  
  3. By: Silliman, Benjamin,
    Holding Institution: New York Botanical Garden, LuEsther T. Mertz Library
    Subjects: Bailey, Jacob Whitman, 1811-1857  Barium sulfate  Berzelius, Jöns Jakob, friherre, 1779-1848  Bray, François-Gabriel, comte de, 1765-1832  Carey, John, 1797-1880  Chemistry  Cooper, Thomas, 1759-1839  Correspondence  Dana, James Dwight, 1813-1895  Datolite  Delafield, Joseph, 1790-1875  Downing, A. J. (Andrew Jackson), 1815-1852  Engelmann, George, 1809-1884  G. & W. Endicott (Firm)  Gale, Leonard D. (Leonard Dunnell), 1800-1883  Glynn, James, 1801-1871  Gray, Asa, 1810-1888  Henry, Joseph, 1797-1878  Hooker, William Jackson, Sir, 1785-1865  Langstaff, W. (William), Dr., active 1811-1822  Lyceum of Natural History (New York, N.Y.)  Martius, Karl Friedrich Philipp von, 1794-1868  Minerals  Nuttall, Thomas, 1786-1859  Rafinesque, C. S. (constantine Samuel), 1783-1840  Silliman, Benjamin, 1779-1864  Torrey, John, 1796-1873  Tuckerman, Edward, 1817-1886  
    BHL Collections: John Torrey Papers | New York Botanical Garden
  4. By: Helle, - Prault, Laurent François, - Gallois, M. - Saint-Aubin, Augustin,
    Publication info: A Paris, Chez Prault, quay de Gesvres, MDCCLXIII [1763]
    Holding Institution: Research Library, The Getty Research Institute (archive.org)
    Subjects: [M. Gallois]  18th century  Auction catalogs  Catalogs  Catalogs and collections  Early works to 1800  Engravings  France  Gallois,  M  Minerals  Natural history  Natural history collections  
  5. By: Egleston, Thomas, - Making of America Project
    Publication info: Washington, Smithsonian Institution, 1863
    Holding Institution: University of California Libraries (archive.org)
    Subjects: Classification  Minerals  Online resources  
  6. By: Galois, M.
    Publication info: A Paris, Chez Didot jeune, M.DCC.LXXX [1780]
    Holding Institution: Smithsonian Libraries
    Subjects: Catalogs and collections  Early works to 1800  Galois,  M  Minerals  Natural history  Natural history collections  
  7. By: Vater, Abraham, - Vidua Gerdesia,
    Publication info: Wittembergae, Apud Viduam Gerdesiam, MDCCXXVI [1726]
    Holding Institution: Smithsonian Libraries
    Subjects: 1684-1751  Botany  Catalogs  Catalogs and collections  Curiosities and wonders  Early works to 1800  Germany  Materia medica  Minerals  Natural history  Natural history collections  Plants  Seeds  Vater, Abraham,  Wittenberg (Saxony-Anhalt)  
  8. By: Vater, Abraham,
    Publication info: Wittembergae, Apud Viduam Gerdesiam, M DCC XXVI. [1726]
    Holding Institution: Wellcome Library (archive.org)
    Subjects: Botany  Catalogues  Curiosities and wonders  Electronic books  Materia medica  Minerals  Plants  Seeds  
  9. By: Dewey, Chester,
    Holding Institution: New York Botanical Garden, LuEsther T. Mertz Library
    Subjects: Agardh, C. A. (Carl Adolf), 1785-1859  Aster  Astragalus  Barratt, Joseph, 1796-1882  Beck, Lewis C. (Lewis Caleb), 1798-1853  Bigelow, Jacob, 1786-1879  Boott, Francis, 1792-1863  Botanical specimens  Brace, John Pierce, 1793-1872  Brassica napus  Brucite  Carex  Chemistry  Childs, Henry H. (Henry Halsey), 1783-1868  Cleaveland, Parker, 1780-1858  Collins, Zaccheus, 1764-1831  Cooley, Dennis, 1787-1860  Correspondence  Crawe, I. B. (Ithamar Bingham), 1792-1847  Cryptogamia  Dana, James Freeman, 1793-1827  Dewey, Chester, 1784-1867  Dickinson, John Dean, 1767-1841  Eaton, Amos, 1776-1842  Elliott, Stephen, 1771-1830  Emmons, Ebenezer, 1799-1863  Entomology  Euonymus  Eupatorium  Flora of the northern and middle sections of the U  Fossils  Fungi  Geological and agricultural survey of Rensselaer C  Geological specimens  Geology  Gibbs, George, 1776-1833  Gramineae  Gray, Asa, 1810-1888  Hall, Frederick, 1780-1843  Halsey, Abraham, 1790-1857  Hitchcock, Edward, 1793-1864  Index to the geology of the Northern States  Jade  Jungermannia  Kellogg, Ebenezer,
    BHL Collections: John Torrey Papers | New York Botanical Garden
  10. By: Streubel, A. V. (August Vollrath)
    Publication info: Berlin, Verlag von Ferdinand Rubach, 1845
    Holding Institution: Smithsonian Libraries
    Subjects: Botanical specimens  Collection and preservation  Minerals  Natural history  Technique  
  11. By: Ravenel, Henry William,
    Holding Institution: Missouri Botanical Garden, Peter H. Raven Library
    Subjects: (Alvan Wentworth),  (Charles Edwin),  (John Lawrence),  (Moses Ashley),  (Willaim St. Julian),  1770-1855  1796-1873  1805-1877  1808-1872  1809-1884  1809-1899  1810-1888  1814-1887  1817-1886  1825-1883  1826-1901  1827-1901  1837-1902  1845-1915  1865-1877  Alismataceae  Allen, Timothy Field,  Azolla  Azollaceae  Baptisia  Bessey, Charles E  Braun, Alexander,  Chapman, A. W  Collectors and collecting  Correspondence  Curtis, M. A  Economic conditions  Engelmann, George,  Fagaceae  Fossils  Fungi  Gray, Asa,  Isoetaceae  Isoetes  Juncaceae  Juncus  LeConte, John L  Leguminosae  Lemna  Lemnaceae  Letters  Liliaceae  Lycopodiaceae  Lycopodium  Mazyck, W. St. J  Meehan, Thomas,  Michaux, François André,  Minerals  Nuphar  Nymphaeaceae  Pinaceae  Pinus  Plants  poverty  Quercus  Ravenel, Henry William,  Reconstruction (U.S. history, 1865-1877)  Sagittaria  Social conditions  Southern States  Torrey, John,  Tuckerman, Edward,  Vitaceae  Vitis  Yucca
    BHL Collections: Engelmann Papers, Missouri Botanical Garden
  12. By: Rafinesque, C. S. (Constantine Samuel),
    Holding Institution: New York Botanical Garden, LuEsther T. Mertz Library
    Subjects: Ackerly, Samuel, Dr  Agardh, C. A. (Carl Adolf), 1785-1859  Aira  Amaranthus  American Philosophical Society  Amphicarpaea  Amphicarpum  Andromeda  Arundinaria gigantea  Atriplex  Aureolaria flava  Baldwin, William, 1779-1819  Barton, William P. C. (William Paul Crillon), 1786  Bartram's Garden (Philadelphia, Pa.)  Beck, Lewis C. (Lewis Caleb), 1798-1853  Bigelow, Jacob, 1786-1879  Blechnum  Botanical specimens  Boykin, Samuel, 1786-1848  Brickellia  Brongniart, Adolphe, 1801-1876  Calamagrostis  Callitriche terrestris  Calochortus  Candolle, Augustin Pyramus de, 1778-1841  Carex  Cassine  Castelnau, Francis, comte de, 1812-1880  Cicuta bulbifera  Clifford, John D., 1778?-1820  Clinton, DeWitt, 1769-1828  Clintonia  Collins, Zaccheus, 1764-1831  Commelina  Conrad, T. A. (Timothy Abbott), 1803-1877  Cooper, William, 1798?-1864  Corema conradii  Correspondence  Croom, Hardy Bryan, 1797-1837  Cyperaceae  Daucus  Desvaux, A.-N. (Auguste-Nicaise), 1784-1856  Dewey, Chester, 1784-1867  Dodecatheon  Duhamel du Monceau, M., 1700-1782  Durand, Elias, 1794-1873  E
    BHL Collections: John Torrey Papers | New York Botanical Garden
  13. By: Wad, Gregorius, - Borgia, Stefano, - Museo Borgiano
    Publication info: Velitris, [publisher not identified], MDCCLXXXXIIII [1794]
    Holding Institution: Smithsonian Libraries
    Subjects: 1731-1804  Antiquities  Borgia, Stefano,  Catalogs  Catalogs and collections  Egypt  Italy  Jewelry, Ancient  Minerals  Museo Borgiano  Natural history collections  Paleontology  Velletri  
    BHL Collections: Unearthed! Smithsonian Libraries' Paleo Collection
  14. By: Cozzens, Fred. S.,
    Holding Institution: New York Botanical Garden, LuEsther T. Mertz Library
    Subjects: Correspondence  Cozzens, Fred. S., active 1814-1825  Minerals  Torrey, John, 1796-1873  United States  
    BHL Collections: John Torrey Papers | New York Botanical Garden
  15. By: Leinz, R. W. (Reinhard W.) - Grimes, D. J. (David J.), - Geological Survey (U.S.)
    Publication info: [Denver, Colo.], U.S. Geological Survey, 1984
    Holding Institution: Bureau of Land Management (archive.org)
    Subjects: Geochemistry  Minerals  Montana  Powell County  Wales Creek Region  
  16. By: Hulse, Gilbert White,
    Holding Institution: New York Botanical Garden, LuEsther T. Mertz Library
    Subjects: Botanical specimens  Canna  Correspondence  Fossils  Gaines, Edmund Pendleton, 1777-1849  Geological specimens  Hulse, Gilbert White, 1807-1883  Maclura pomifera  Minerals  Persea americana  Sabal palmetto  Scott, Winfield, 1786-1866  Seminole War, 2nd, 1835-1842  Torrey, John, 1796-1873  Zamia integrifolia  
    BHL Collections: John Torrey Papers | New York Botanical Garden
  17. By: Thon, Theodor, - Boitard, Pierre, - Uckermann, J. I.,
    Publication info: Ilmenau Druck und Verlag von Bernh. Fried. Voigt 1827
    Holding Institution: Smithsonian Libraries
    Subjects: Botanical specimens  Catalogs and collections  Collection and preservation  Minerals  Natural history  Taxidermy  Technique  Zoological specimens  
  18. Historiae naturalis Hassiae inferioris pars prima : qua potiora & elegantiora hujus fossilia, figurata aeque ac certa quadam & regulari figura carentia, eaq[ue], vel lapidea vel metallica, ita in lucem protrahuntur publicam necessariisq[ue] iconismis illustrantur, ut cuilibet curioso in illis conchas genuinas marinas, plantas, pisces aliaq[ue] naturae admiranda cernere & per haec magnum creatorem laudare liceat = i.e. Der Natur-Geschichte des Nieder-Fürstenthums Hessen erster Theil : worinnen dessen vornehmste und zierlichste sowol gebildete als ungebildete, zu Theils in Stein, zu Theils in Metallen bestehende Fossilia dergestalten an des Tages Licht hervor gebracht werden, dass ein jeder Curiosus an denen ersten veritablen See-Muscheln, Pflantzen, Fische, auch andere Seltenheiten der Natur täglich beschauen und dadurch den grossen Schöpffer preisen kan
    By: Wolfart, Peter, - Corvinus, Johann August, - Thelot, Johann Andreas, - Harmes, Heinrich.
    Publication info: Cassel, Gedruckt bey Heinrich Harmes, fürstl. hess. Hof-Buchdrucker, anno 1719
    Holding Institution: Research Library, The Getty Research Institute (archive.org)
    Subjects: 19th century  Cabinets of curiosities  Early works to 1800  Engravings  Fossils  Germany  Hesse  Minerals  Natural history  Paleontology
  19. By: Solly, Samuel, - Travers, Benjamin, - King's College London.
    Edition: Second edition.
    Publication info: London Longman, Brown, Green and Longmans MDCCCXLVII. [1847]
    Holding Institution: King's College London, Foyle Special Collections Library (archive.org)
    Subjects: Anatomy  Anatomy, Compararive  Anatomy, Pathological  Balneology  Brain  Cancer  Cerebrovascular system  Delirium tremens  Digitalis (Drug)  Diseases  Dissection  Electronic books  Epilepsy  Hemorrhage  Hydrocephalus  Hysteria  Insanity (Law)  Mental illness  Minerals  Nervous system  Neurophysiology  Opium  Phlebotomy  physiology  Physiology, Comparative  Scarlatina  Therapeutic use  Therapeutics  Tumors
  20. By: Teschemacher, James E. (James Englebert),
    Holding Institution: New York Botanical Garden, LuEsther T. Mertz Library
    Subjects: Berzelius, Jöns Jakob, friherre, 1779-1848  Botanical specimens  Correspondence  Erysimum capitatum  Erysimum perofskianum  Gelasine elongata  Geology  Gray, Asa, 1810-1888  Hall, James, 1811-1898  Hosackia  Jackson, Charles T. (Charles Thomas), 1805-1880  Minerals  Nuttall, Thomas, 1786-1859  Oenothera  Plants  Podalyria  Scilla  Silliman, Benjamin, 1779-1864  Sullivant, William Starling, 1803-1873  Teschemacher, James E. (James Englebert), 1790-185  Tigridia  Torrey, John, 1796-1873  Tourmaline  Tuckerman, Edward, 1817-1886  
    BHL Collections: John Torrey Papers | New York Botanical Garden
  21. By: Scouler, John,
    Holding Institution: New York Botanical Garden, LuEsther T. Mertz Library
    Subjects: Botanical specimens  Colden, Cadwallader, 1688-1776  Correspondence  Minerals  Plants  Portugal  Royal Dublin Society  Scouler, John, 1804-1871  Torrey, John, 1796-1873  
    BHL Collections: John Torrey Papers | New York Botanical Garden
  22. By: Stephenson, John, - Royal College of Physicians of Edinburgh.
    Publication info: London, John Churchill, 1838
    Holding Institution: Royal College of Physicians in Edinburgh (archive.org)
    Subjects: Electronic books  Materia medica  Minerals  Zoology  
  23. By: Bittenbender, Peter E. - United States. Bureau of Land Management. Alaska State Office.
    Publication info: Anchorage, Alaska, U.S. Department of the Interior, Bureau of Land Management, Alaska State Office, 2007
    Holding Institution: Bureau of Land Management (archive.org)
    Subjects: Admiralty Island  Admiralty Island (Alaska)  Alaska  Analysis  Minerals  Mines and mineral resources  Prospecting  
  24. By: Kurr, J. G. (Johann Gottlob), - Van Voorst, John, - Edmonston & Douglas,
    Publication info: Edinburgh, Edmonston and Douglas, 88 Princes Street, 1859
    Holding Institution: Smithsonian Libraries
    Subjects: Mineralogy  Minerals  Pictorial works  Popular works  
    BHL Collections: Unearthed! Smithsonian Libraries' Paleo Collection
  25. By: United States. Bureau of Land Management. Portland Service Center.
    Publication info: Portland, Or, U.S. Department of the Interior, Bureau of Land Management, Portland Service Center, 1972
    Holding Institution: Bureau of Land Management (archive.org)
    Subjects: Bibliography  Bureau of Land Management  Economic aspects  Hard rock minerals  Mineral industries  Minerals  Mines and mineral resources  Records and correspondence  United States  Valuation  
  26. By: United States. Bureau of Land Management. Portland Service Center.
    Publication info: Portland, Or, U.S. Department of the Interior, Bureau of Land Management, Portland Service Center, 1970
    Holding Institution: Bureau of Land Management (archive.org)
    Subjects: Bibliography  Bureau of Land Management  Economic aspects  Hard rock minerals  Mineral industries  Minerals  Mines and mineral resources  Records and correspondence  United States  Valuation  
  27. By: United States. Bureau of Land Management. Portland Service Center.
    Publication info: Portland, Or, U.S. Department of the Interior, Bureau of Land Management, Portland Service Center, 1971
    Holding Institution: Bureau of Land Management (archive.org)
    Subjects: Bibliography  Bureau of Land Management  Economic aspects  Hard rock minerals  Mineral industries  Minerals  Mines and mineral resources  Records and correspondence  United States  Valuation  
  28. By: U.S. Fish and Wildlife Service. Region 1. - Nellis Air Force Base (Nev.) - United States. Bureau of Land Management. Nevada State Office.
    Publication info: [Portland, Or.], U.S. Department of the Interior, Fish & Wildlife Service, Pacific Region, 1994
    Holding Institution: Bureau of Land Management (archive.org)
    Subjects: Desert National Wildlife Range  Desert National Wildlife Range (Nev.)  Environmental aspects  Minerals  Mines and mineral resources  Nevada  Wildlife conservation  Wildlife management areas
  29. By: Bockenhoffer, Johann Joachim. - Brackenhoffer, Élie,
    Publication info: Argentorati, [s.n.], anno recuperatae salutis, 1677
    Holding Institution: Smithsonian Libraries
    Subjects: 1618-1682  Art  Book collecting  Brackenhoffer, Élie,  Catalogs  Catalogs and collections  Collectors and collecting  Early works to 1800  France  Minerals  Natural history  Natural history collections  Private collections  Strasbourg  
  30. By: Hebenstreit, Johann Ernst, - Richter, Johann Christophe, - Richter, Georg Friedrich, - Christ, Johann Friedrich,
    Publication info: Lipsiae, excudi curavit C. Fritsch, 1743
    Holding Institution: Harvard University, Museum of Comparative Zoology, Ernst Mayr Library
    Subjects: Catalogs and collections  Minerals  Natural history
  31. By: Farrington, Oliver C. (Oliver Cummings), - Tillotson, Edwin Ward, Jr. - Field Columbian Museum.
    Publication info: Chicago, Field Columbian Museum, 1908
    Holding Institution: University Library, University of Illinois Urbana Champaign
    Subjects: Catalogs and collections  Minerals
  32. Publication info: Pavia, Tipografia in ditta eredi Bizzoni, 1864
    Holding Institution: University Library, University of Illinois Urbana Champaign
    Subjects: Animals  Composition  Irrigation water  Italy  Minerals  Natural history  Pavia  Quality  Water  
  33. By: Loew, Oscar,
    Publication info: Washington, G.P.O, 1899
    Holding Institution: U.S. Department of Agriculture, National Agricultural Library
    Subjects: Assimilation  Minerals  Plant physiology  Plants  
  34. By: United States. Department of Agriculture. - Loew, Oscar. - United States. Bureau of Plant Industry.
    Publication info: Washington, U.S. G.P.O, 1903
    Holding Institution: U.S. Department of Agriculture, National Agricultural Library
    Subjects: Agriculture  Assimilation  Minerals  Periodicals  Plant physiology  Plants  United States
  35. By: Geological Survey (U.S.) - United States. Bureau of Mines.
    Publication info: [Washington, D.C.], U.S. Department of the Interior, Bureau of Mines, 1976
    Holding Institution: Bureau of Land Management (archive.org)
    Subjects: Classification  Minerals  Mines and mineral resources  United States  
  36. By: Whitlock, Herbert P.
    Publication info: New York, American Museum of Natural History, 1932
    Holding Institution: American Museum of Natural History Library
    Subjects: Minerals  Popular works  
  37. By: University of the State of New York. - University of the State of New York. Board of Regents. - Beck, Lewis C. (Lewis Caleb), - Hall, James, - Hoffman, Abram J., - Hough, Franklin B. (Franklin Benjamin), - Lansing, Gerrit Yates, - Morgan, Lewis Henry, - Pease, Richard H., - Weed, Parsons & Co.,
    Edition: Rev. ed.
    Publication info: Albany, Weed, Parsons, 1850
    Holding Institution: Multiple institutions
    Subjects: 1817-1840  1850  Antiquities  Cabinet of Natural History  Catalogs  Catalogs and collections  Costumes  De Rham, Henry Casimir,  Embossed bindings (Binding)  Fossils  Indians of North America  Jr.,  Mineralogy  Minerals  Natural history  Natural history collections  New York (State)  Seneca Indians  State Cabinet of Natural History (N.Y.)  United States  
  38. By: Nuttall, Thomas,
    Holding Institution: New York Botanical Garden, LuEsther T. Mertz Library
    Subjects: Actaea  Aquilegia  Boott, Francis, 1792-1863  Botanical specimens  Briza  Cornus  Correspondence  Durand, Elias, 1794-1873  Epilobium  Fraser, John, active 1790-1860  Genera of North American plants  Gray, Asa, 1810-1888  Hooker, William Jackson, Sir, 1785-1865  Hosackia  Koeleria  Lambert, Aylmer Bourke, 1761-1842  Megastachya  Minerals  Muhlenberg, Henry, 1753-1815  Nuttall, Thomas, 1786-1859  Poa  Psychopsis  Pursh, Frederick, 1774-1820  Rhynchosia  Royal Botanic Gardens, Kew  Syrmatium  Torrey, John, 1796-1873  Torreya  Wray, Thomas Jarram, 1781-1851  
    BHL Collections: John Torrey Papers | New York Botanical Garden
  39. By: Ingalls, Thomas Russell,
    Holding Institution: New York Botanical Garden, LuEsther T. Mertz Library
    Subjects: Acalypha  Aquatic plants  Botanical specimens  Carex  Chemical apparatus  Correspondence  Cyperus  Cypraeovula fuscodentata  Elliott, Stephen, 1771-1830  Gray, Asa, 1810-1888  Helenium  Ingalls, Thomas Russell, active 1834-1835  Justicia  Louisiana  Lyceum of Natural History (New York, N.Y.)  Minerals  Nelumbo lutea  Plants  Scirpus  Shells  Sorghastrum nutans  Torrey, John, 1796-1873  
    BHL Collections: John Torrey Papers | New York Botanical Garden
  40. By: Werner, Abraham Gottlob, - Guyton de Morveau, Claudine Poullet, baronne.
    Publication info: A Dresde, Chez les Freres Walther, 1795
    Holding Institution: Smithsonian Libraries
    Subjects: Classification  Early works to 1800  Mineralogy, Determinative  Minerals  Paleontology  
  41. By: Bingley, William,
    Edition: 3rd ed.
    Publication info: London, Baldwin Cradock, and Joy, 1821
    Holding Institution: Wellcome Library (archive.org)
    Subjects: Botany  Economics  Electronic books  Minerals  Natural history  Plant extracts  Zoology  
  42. By: Leysser, Friedrich Wilhelm von, - Wehrn, Christian Wilhelm.
    Publication info: Halle, Gedruckt bei Joh. Christ. Hendel, [1816]
    Holding Institution: Smithsonian Libraries
    Subjects: 1731-1815  Bibliography  Catalogs  Catalogs and collections  Germany  Law  Leysser, Friedrich Wilhelm von,  Library  Minerals  Natural history  Natural history collections  Private collections  Scientific apparatus and instruments  Wehrn, Christian Wilhelm  
  1. By: Cuzzuol, Geraldo Rogério Faustini - Campos, Andréa
    Type: Article
    In: Sociedade Botânica de São Paulo
    Date: 2001-06-01
    Publication Info: Sociedade Botânica de São Paulo 2001-06-01
    Subjects: Avicennia germinans  Laguncularia racemosa  mangrove  Minerals  Rhizophora mangle  Zonation
  2. By: Braga, Weslley F. - Araújo,Janaína G - Martins,Graciela P - Oliveira,Silvio L - Guimarães,Igo G
    Type: Article
    In: Pontificia Universidad Católica de Valparaíso<BR>Facultad de Recursos Naturales<BR>Escuela de Ciencias del Mar
    Date: 2016-03-01
    Publication Info: Pontificia Universidad Católica de Valparaíso<BR>Facultad de Recursos Naturales<BR>Escuela de Ciencias del Mar 2016-03-01
    Subjects: Aquaculture  Carassius auratus  Minerals  Nutrition  Ornamental fish  phosphorus requirement