Plantae preissianae sive enumeratio plantarum quas in australasia occidentali et meridionali-occidentali annis 1838-1841 collegit Ludovicus Preiss - Lehmann, Johann Georg Christian, 1792 -1860 (Sumptibus Meissneri, 1844)

Plantae quaedam niloticae : quas in itinere cum divo Adalberto libero barone de Barnim facto collegit Robertus Hartmann - Schweinfurth, Georg August, 1836 -1925 (G. Reimer, 1862)

Plantae Scandinaviae; descriptionibus et figuris analyticis adumbratae - Andersson, N. J. (Nils Johan), 1821 -1880 (Sumptibus Z. Haeggström, 1849)

Plantae Tinneanae :sive descriptio plantarum in expeditione tinneana ad flumen Bahr-el-Ghasal eiusque affluentias in septentrionali interioris Africae parte collectarum - Tinne, Alexandrina, P. F. (Typis Caroli Gerold Filii, 1867)

Plantae Wrightianae e Cuba orientali - Gray, Asa, 1810 -1888 (1862)

Plantae Wrightianae texano-neo-mexicanae :an account of a collection of plants made by Charles Wright ... - Gray, Asa, 1810 -1888 (Smithsonian Institution, 1852)

Plantarum brasiliensium :decas prima [-tertia] - Thunberg, Carl Peter, 1743 -1828 (typis Zeipel et Palmblad, 1821)

Plantarum Guianae rariorum icones et descriptiones hactenus ineditae - Rudge, Edward, 1763 -1846 (Sumptibus auctoris, 1805)

Plantarum imagines et descriptiones floram Russicam illustrantes - Trautvetter, Ernst Rudolph von, 1809 -1889 (Impensis Auctoris Prostat Apud E. Schweizerbart Stuttgartiae, 1844)

Plantarum novarum ex Herbario Sprengelii centuriam - Sprengel, Kurt Polycarp Joachim, 1766 -1833 (F.A. Grunerti Patr, 1807)

Plantas Abichianas in itineribus per Caucasum regionesque Transcaucasicas collectas - Bunge, Alexander von, 1803 -1890 (Buchdr. der Kaiserlichen Akademie der Wissenschaften, 1858)

Plantas Hartwegianas :imprimis mexicanas adjectis nonnullis Grahamianis enumerat novasque - Bentham, George, 1800 -1884 ([G. Pamplin,], 1839)

Plantas nuevas chilenas ... - Philippi, Rodolfo Amando, 1808 -1904 (Impr. Cervantes, 1893)

Plantenkunde voor Indië - Haak, J. (G. C. T. Van Dorp & Co, 1892)

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The Pliocene floras of the Dutch-Prussian border - Reid, Clement, 1853 -1916 (M. Nijhoff, 1915)

Popular botany; the living plant from seed to fruit - Step, Edward, 1855 -1931 (H. Holt and company, 1913)

The Popular educator: a complete encyclopaedia of elementary, advanced and technical education (Cassell, 1888)

Popular Science Review (1873)

Popular scientific recreations in natural philosophy, astronomy, geology, chemistry - Tissandier, Gaston, 1843 -1899 (Ward, Lock, 1883)

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Principia botanica: or, A concise and easy introduction to the sexual botany of Linnaeus ... Arranged in a tabular form, under each class and order; and digested alphabetically under several generic distinctions. Together with three indexes ... Also a table of several vegetable drugs not in the indexes ... - Darwin, Robert Waring, 1724 -1816 (Printed and sold by M. Hage; [etc., etc.], 1810)

Principia botanica: or, a concise and easy introduction to the sexual botany of Linnaeus ... - Linné, Carl von, 1707 -1778 (Printed by Allin and co. and sold by G. G. J. and J. Robinson, London, 1787)

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Proceedings of the American Academy of Arts and Sciences - American Academy of Arts; Sciences. (Metcalf and Co, 1862)

Proceedings of the American Academy of Arts and Sciences - American Academy of Arts; Sciences. (Metcalf and Co, 1865)

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Proceedings of the American Academy of Arts and Sciences - American Academy of Arts; Sciences. (Metcalf and Co, 1873)

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Proceedings of the Biological Society of Washington - Smithsonian Institution (Biological Society of Washington, 1911)

Proceedings of the Biological Society of Washington - Smithsonian Institution (Biological Society of Washington, 1912)

Proceedings of the Biological Society of Washington - Smithsonian Institution (Biological Society of Washington, 1932)

Proceedings of the Biological Society of Washington - Smithsonian Institution (Biological Society of Washington, 1961)

Proceedings of the Biological Society of Washington - Smithsonian Institution (Biological Society of Washington, 1974)