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Eesti Looduseuurijate Seltsi aastaraamat - Eesti Looduseuurijate Selts. (Valgus, 1912)

Elementary botany - Atkinson, George Francis, 1854 -1918 (Holt, 1898)

Elemente der paläontologie bearbeitet - Döderlein, Ludwig, 1855 -1936 (Engelmann, 1890)

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Enumeratio plantarum Guatemalensium imprimis a H. de Tuerckheim collectarum - Smith, John Donnell, 1829 -1928 (H.N. Patterson, 1903)

An enumeration of Philippine flowering plants - Merrill, Elmer D. (Elmer Drew), 1876 -1956 (Bureau of Printing, 1922)

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An enumeration of the vascular plants known from Surinam : together with their distribution and synonymy - Pulle, A. A. (August Adriaan), 1878 -1955 (E. J. Brill, 1906)

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Experimental and molecular approaches to plant biosystematics - Hoch, Peter C (Missouri Botanical Garden, 1995)

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The fertilisation of flowers - Darwin, Charles, 1809 -1882 (Macmillan, 1883)

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Flora and vegetation of the Sierra Ancha Experimental Forest, Arizona - Pase, C. P., 1926 - (Rocky Mountain Forest and Range Experiment Station, Forest Service, U.S. Dept. of Agriculture, 1968)

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Flora Brasiliensis, enumeratio plantarum in Brasilia hactenus detectarum :quas suis aliorumque botanicorum studiis descriptas et methodo naturali digestas partim icone illustratas - Martius, Karl Friedrich Philipp von, 1794 -1868 (R. Oldenbourg, 1927)

Flora Brasiliensis, enumeratio plantarum in Brasilia hactenus detectarum :quas suis aliorumque botanicorum studiis descriptas et methodo naturali digestas partim icone illustratas - Martius, Karl Friedrich Philipp von, 1794 -1868 (R. Oldenbourg, 1842)

Flora capensis :being a systematic description of the plants of the Cape colony, Caffraria, & Port Natal (and neighbouring territories) - Harvey, William H. (William Henry), 1811 -1866 (L. Reeve, 1900)

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Flora de Nicaragua - Stevens, Warren Douglas, 1944 - (Missouri Botanical Garden Press, 2001)

Flora de Veracruz (Instituto de Ecología, AC, 2014)