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Proceedings of the Royal Society of London. Series B, Containing papers of a Biological character - Royal Society (Great Britain) (Printed for the Royal Society and sold by Harrison & Sons, 1913)

Proceedings of the section of sciences - Koninklijke Akademie van Wetenschappen (Netherlands) (Johannes Müller, 1919)

Proceedings of the South London Entomological & Natural History Society - South London Entomological; Natural History Society (South London Entomological and Natural history Society, 1914)

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Prodrom der Waldstätter Gefässpflanzen - Rhiner, Joseph, 1830? -1897 (J. Bürgler, 1870)

Prodrome de la flore Belge - De Wildeman, Emile 1866 -1947 (Alfred Castaigne, 1898)

Prodrome de la flore Belge - De Wildeman, Emile 1866 -1947 (Alfred Castaigne, 1899)

Prodrome de la flore belge - Wildeman, E. de (Emile), 1866 -1947 (A. Castaigne, 1898)

Prodrome de la flore des environs d'Anvers et d'une partie de la Campine - Société Encyclographique Des Sciences Médicales (1841)

Prodrome de la flore du Grand-Duché de Luxembourg - Koltz, J. P. J. (Jean Pierre Joseph), 1827 -1907 (L. Schamburger, 1873)

Prodromo della flora toscana, ossia, Catalogo metodico delle piante che nascono salvatiche in Toscana e nelle sue isole, o che vi sono estesamente coltivate, con la indicazione dei luoghi nei quali si trovano, del tempo della loro fioritura e fruttificazione, dei loro nomi volgari ed usi - Caruel, Teodoro, 1830 -1898 (Coi tipi di F. Le Monnier, 1860)

Prodromul florei române; sau, Enumeratiunea plantelor pana asta-di cunoscute in Moldova si Valachia - Brândză, D. (Dimitrie), 1847 -1895 (Tip. Academiei Romane, 1879)

Prodromus einer Flora des Kronlandes Salzburg und dessen angränzenden Ländertheilen ... - Hinterhuber, Julius, 1810 -1880 (Druck der Oberer'schen Buchdr, 1851)

Prodromus florae argentoratensis - Spielmann, Jacob Reinbold, 1722 -1783 (Apud J.G. Bauerum, 1766)

Prodromus florae batavae; nieuwe lijst der Nederlandsche phanerogamen en vaatkryptogamen - Nederlandsche Botanische Vereeniging (F.E. Macdonald, 1901)

Prodromus florae Comitatus Nitriensis : sistens plantas phanerogamicas et cryptogamicas vasculares in Comitatu Nitriensi hucusque observatas - Knapp, Josef Armin, 1843 -1899 (Dispendiis auctoris, 1865)

Prodromus florae Hispanicae :seu Synopsis methodica omnium plantarum in Hispania, sponte nascentium vel frequentius cultarum quae innotuerunt - Willkomm, Moritz, 1821 -1895 (E. Schweizerbart, 1880)

Prodromus florae hispanicae, seu synopsis methodica omnium plantarum in Hispania - Willkomm, Moritz, 1821 -1895 (E. Schweizerbart, 1880)

Prodromus florae Monasteriensis Westphalorum. Phanerogamia - Bönninghausen, Clemens Maria Franz von, 1785 -1864 (F. Regensberg, 1824)

Prodromus florae mosquensis - Martius, Heinrich von, 1781 -1831 (In Commercio Industriae, 1817)

Prodromus florae stargardiensis : continens plantas in Ducatu Megapolitano-Stargardiensi S. Strelitzensi sponte provenientes - Schultz, Karl Friedrich, 1765 -1837 (sumtibus C. F. E. Spaethen, 1806)

Prodromus florae Suidniciensis - Helmrich, Karl, 1833 - (Gustavus Schade, 1857)

Prodromus stirpium in horto ad Chapel Allerton vigentium - Salisbury, R. A. (Richard Anthony), 1761 -1829 ([s.n.], 1796)

Prof. dr. Thomé's Flora von Deutschland, Österreich und der Schweiz, in wort und bild, für schule und haus ... mit ... - Migula, W. (Walter), 1863 -1938 (1905)

Prof. dr. Thomé's Flora von Deutschland, Österreich und der Schweiz, in wort und bild, für schule und haus ... mit ... - Migula, W. (Walter), 1863 -1938 (1913)

A provisional host-index of the fungi of the United States - Farlow, W. G. (William Gilson), 1844 -1919 (1888)

The pruning-manual, being the 18th ed., rev. and reset - Bailey, L. H. (Liberty Hyde), 1858 -1954 (The Macmillan company; [etc., etc.], 1916)

Pugillus plantarum imprimis Hispanicarum, quas in itinere 1851-52 - Lange, Johan, 1818 -1898 (B. Luno, 1860)

Die Pusztenflora der grossen ungarischen Tiefebene - Woenig, Franz, 1851 -1899 (Verlag von Carl Meyers Graphischem Institut, 1899)

The quantitative method in biology - MacLeod, Julius, 1857 -1919 (University Press, 1919)

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Rambles in search of wild flowers, and how to distinguish them - Plues, Margaret (Journal of horticulture and cottage gardener, 1864)

Die Raupen der gross-schmetterlinge Europas - Hofmann, Ernst, 1837 -1892 (Verlag der C. Hoffmann, 1893)

Raupen-Kalendar : nach den Futterpflanzen geordnet für das mitteleuropäische Faungebiet - Rapp, O. (O. Rapp, 1908)

Raupenkalender oder Systematisches Verzeichniss aller Raupen, welche in Deutschland bekannt sind - Schott, J. J. (P.H. Guilhauman, 1830)

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Relation d'une promenade botanique faite dans la Campine au mois de juillet 1832 - Kickx, Jean, 1803 -1864 (J.B. Tircher, 1833)

Reliably hardy evergreens for fall planting : autumn 1915 - Henry G. Gilbert Nursery; Seed Trade Catalog Collection. (New England Nurseries, 1915)

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Reliquiae Formánekianae : enumeratio critica plantarum vascularium, quas itineribus in Haemo Peninsula et Asia Minore (Bithynia) factis collegit Dr. Ed. Formánek - Vandas, Karel, 1861 -1923 (Comitiorum Marchionatus Moraviae, 1909)

Remarks on the geographical distribution of British plants : chiefly in connection with latitude, elevation, and climate - Watson, Hewett Cottrell, 1804 -1881 (Printed for Longman, Rees, Orme, Brown, Green, and Longman, 1835)

Les remèdes des champs : herborisations pratiques a l'usage des instituteurs, des ecclésiastiques et de tous ceux qui donnent leurs soins aux malades - Saffray, Charles, 1838 - (Hachette, 1883)

Rendiconti - Reale Accademia dei Lincei (l'Accademia, 1887)

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Repertorium botanices systematicae - Walpers, Wilhelm Gerhard, 1816 -1853 (Sumtibus Friderici Hofmeister, 1844)

Repertorium botanices systematicae - Walpers, Wilhelm Gerhard, 1816 -1853 (Sumtibus Friderici Hofmeister, 1845)

Repertorium specierum novarum regni vegetabilis (Selbstverlag des Herausgebers, 1910)

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Revue générale de botanique (Libraire générale de l'enseignement, 1910)

Revue générale de botanique (Libraire générale de l'enseignement, 1911)

Revue générale de botanique (Libraire générale de l'enseignement, 1913)

Revue générale de botanique (Libraire générale de l'enseignement, 1914)

Revue générale de botanique (Libraire générale de l'enseignement, 1920)

Revue générale des sciences pures et appliquées ([s.n.], 1899)

Revue horticole (Librairie agricole de la maison rustique, 1864)