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A popular history of the British ferns, and the allied plants, comprising the club-mosses, pepperworts, and horsetails - Moore, Thomas, 1821 -1887 (Routledge, Warne & Routladge, 1862)

A popular history of the British ferns and the allied plants, comprising the club-mosses, pepperworts, and horsetails - Moore, Thomas, 1821 -1887 (Routledge, Warne, & Routledge, 1859)

Popular Science Review (1864)

Popular Science Review (1865)

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

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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)

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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)

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

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

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

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

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

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

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

Pteridologist - British Pteridological Society. (The Society, 2017)

Pteridologist - British Pteridological Society. (The Society, 2018)

Pteridologist - British Pteridological Society. (The Society, 2019)

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The Quarterly journal of science (J. Churchill and Sons, etc, 1864)

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Rare plants of New York State - Mitchell, Richard S., 1938 - (New York State Museum, University of the State of New York, State Education Dept, 1981)