Proceedings of the Royal Irish Academy - Royal Irish Academy. (Royal Irish Academy, 1911)

Proceedings of the Royal Irish Academy - Royal Irish Academy. (Royal Irish Academy, 1913)

Proceedings of the Royal Society of Edinburgh - Royal Society of Edinburgh. (Royal Society of Edinburgh, 1884)

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, 1912)

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, 1920)

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, 1921)

Proceedings of the Royal Society of London - Royal Society (Great Britain) (The Society, 1878)

Proceedings of the Royal Society of London - Royal Society (Great Britain) (The Society, 1883)

Proceedings of the Royal Society of London - Royal Society (Great Britain) (The Society, 1884)

Proceedings of the Royal Society of London - Royal Society (Great Britain) (The Society, 1887)

Proceedings of the Royal Society of London - Royal Society (Great Britain) (The Society, 1895)

Proceedings of the Royal Society of London - Royal Society (Great Britain) (The Society, 1897)

Proceedings of the Royal Society of London - Royal Society (Great Britain) (The Society, 1899)

Proceedings of the Royal Society of London - Royal Society (Great Britain) (The Society, 1903)

Proceedings of the Royal Society of Victoria. New series - Royal Society of Victoria (Melbourne, Vic.) (Stillwell and Co, 1951)

Proceedings of the Royal Society of Victoria. New series - Royal Society of Victoria (Melbourne, Vic.) (Stillwell and Co, 1964)

Proceedings of the semi-centennial anniversary of the Torrey botanical club, October 18, 19 and 20, 1917 - Torrey Botanical Club. (1918)

Proceedings of the United States National Museum - Smithsonian Institution (Smithsonian Institution Press, [etc.], 1882)

Proceedings of the United States National Museum - Smithsonian Institution (Smithsonian Institution Press, [etc.], 1894)

Proceedings of the United States National Museum - Smithsonian Institution (Smithsonian Institution Press, [etc.], 1901)

Proceedings of the United States National Museum - Smithsonian Institution (Smithsonian Institution Press, [etc.], 1912)

Proceedings of the United States National Museum - Smithsonian Institution (Smithsonian Institution Press, [etc.])

Proceedings of the Zoological Society of London - Zoological Society of London. (Academic Press, [etc.], 1887)

Procès-verbaux - Société Linnéenne de Bordeaux. (1895)

Procès-verbaux - Société Linnéenne de Bordeaux. (1947)

Procès-verbaux - Société Linnéenne de Bordeaux. (1960)

Prodrome d'une histoire des végétaux fossiles - Brongniart, Adolphe, 1801 -1876 (F. G. Levrault, 1828)

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

Prodrome de la flore corse : comprenant les résultats botaniques de six voyages exécutés en Corse sous les auspices de M. Emile Burnat - Briquet, John, 1870 -1931 (Georg, 1910)

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

Prodromo della storia naturale generale e comparata d'Italia ... - Marmocchi, Francesco Constantino, 1805 -1858 (Società editrice fiorentina, 1844)

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

Prodromus der Flora von Böhmen. Enthaltend die Beschreibungen und Verbreitungsangaben der wildwachsenden und im Freien kultivirten Gefässpflanzen des Königreiches ... - Celakovský, Ladislav Josef, 1834 -1902 (Selbstverlag des Comité's, 1867)

Prodromus florae Hispanicae :seu Synopsis methodica omnium plantarum in Hispania, sponte nascentium vel frequentius cultarum quae innotuerunt - Willkomm, Moritz, 1821 -1895 (E. Schweizerbart, 1861)

Prodromus florae hispanicae, seu synopsis methodica omnium plantarum in Hispania - Willkomm, Moritz, 1821 -1895 (E. Schweizerbart, 1861)

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

Prodromus florae Novae-Hollandiae et Insulae van-Diemen : exhibens characteres plantarum - Brown, Robert, 1773 -1858 (Veneunt a reductione Isidis, 1821)

Prodromus florae Novae Hollandiae et Insulae Van-Diemen : exhibens characteres plantarum - Brown, Robert, 1773 -1858 (Sumtibus L. Schrag, 1827)

Prodromus florae Novae Hollandiae et Insulae Van-Diemen, exhibens characteres plantarum - Brown, Robert, 1773 -1858 (Typis R Taylor, veneunt apud J. Johnson, 1810)

Prodromus florae Novae Hollandiae et Insulae Van-Diemen, exhibens characteres plantarum - Brown, Robert, 1773 -1858 (typis R. Taylor et socii, 1810)

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 veronensis - Goiran, A. (Agostino), 1835 -1909 (1882)

Prof. dr. Thom©♭'s Flora von Deutschland, ©sterreich und der Schweiz in wort und bild f©ơr schule und haus - Thomé, Otto W. (Otto Wilhelm), 1840 -1925 (F. E. K©œhler, 1886)

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 (1886)

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 (1903)

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 (1889)

Profits will be made by buyers of stock from this special fall list : August 20 to November 15, 1929 - Henry G. Gilbert Nursery; Seed Trade Catalog Collection. (E.C. Robbins, 1929)

Progressus rei botanicae = Fortschritte der Botanik = Progrès de la botanique = Progress of botany - Association internationale des botanistes. (G. Fischer, 1907)

Progressus rei botanicae = Fortschritte der Botanik = Progrès de la botanique = Progress of botany - Association internationale des botanistes. (G. Fischer, 1911)

Progressus rei botanicae = Fortschritte der Botanik = Progrès de la botanique = Progress of botany - Association internationale des botanistes. (G. Fischer, 1914)

Pronunciation of plant names - Garden Club of America. (Reproduced and printed by National Process Company], 1922)

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

A provisional list of the parasitic fungi of Wisconsin - Davis, John Jefferson. (1914)

Pteridologia : a publication of the American Fern Society - American Fern Society. (The Society, 1989)

Pteridologia : a publication of the American Fern Society - American Fern Society. (The Society, 2002)

Pteridologia : a publication of the American Fern Society - American Fern Society. (The Society, 2007)

Pteridologist - British Pteridological Society. (The Society, 1984)

Pteridologist - British Pteridological Society. (The Society, 1985)

Pteridologist - British Pteridological Society. (The Society, 1987)

Pteridologist - British Pteridological Society. (The Society, 1988)

Pteridologist - British Pteridological Society. (The Society, 1989)

Pteridologist - British Pteridological Society. (The Society, 1990)

Pteridologist - British Pteridological Society. (The Society, 1996)

Pteridologist - British Pteridological Society. (The Society, 1997)

Pteridologist - British Pteridological Society. (The Society, 1999)

Pteridologist - British Pteridological Society. (The Society, 2001)

Pteridologist - British Pteridological Society. (The Society, 2002)

Pteridologist - British Pteridological Society. (The Society, 2003)

Pteridologist - British Pteridological Society. (The Society, 2005)

Pteridologist - British Pteridological Society. (The Society, 2006)

Pteridologist - British Pteridological Society. (The Society, 2008)

Pteridologist - British Pteridological Society. (The Society, 2009)

Pteridologist - British Pteridological Society. (The Society, 2010)

Pteridologist - British Pteridological Society. (The Society, 2011)

Pteridologist - British Pteridological Society. (The Society, 2012)

Pteridologist - British Pteridological Society. (The Society, 2013)

Pteridologist - British Pteridological Society. (The Society, 2014)

Pteridologist - British Pteridological Society. (The Society, 2015)

Pteridologist - British Pteridological Society. (The Society, 2016)