Eastern states endangered plants - Arndt, Raymond E. (U.S. Dept. of the Interior, Bureau of Land Management, 1980)

An ecological characterization of Coastal Maine (north and east of Cape Elizabeth) - U.S. Fish; Wildlife Service (Department of the Interior, U.S. Fish and Wildlife Service, Northeast Region, 1980)

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Economic plants of Porto Rico - Cook, O. F. (Orator Fuller), 1867 -1949 (Govt. Print Off, 1903)

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Enhancement restoration and creation of vernal pools at Del Sol Open Space and Vernal Pool Reserve, Santa Barbara County, California - Ferren, Wayne R. (University of California, Santa Barbara, 1988)

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Entomologische berichten - Nederlandse Entomologische Vereniging (2010)

Entomologische berichten - Nederlandse Entomologische Vereniging (2012)

Entomologische berichten - Nederlandse Entomologische Vereniging (2016)

Entomologische berichten - Nederlandse Entomologische Vereniging (2017)

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Enumeratio plantarum in Fennoscandia orientali sponte et subsponte nascentium. Förteckning öfver ormbunkar och fröväxter vildtväxande och förvildade i Finland och angränsande delar af Ryssland. Luettelo saniaisista ja siemenkasveista jotka kasvavat villeinä tai metsistyneinä Suomessa ja siihen rajoittuvissa osissa Venäjää - Lindberg, Harald, 1871 - (Söderström, 1901)

Enumeratio plantarum novarum a cl. Schrenk lectarum - Meyer, Carl Anton, 1795 -1855 (Typis G. Fischeri, 1841)

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Enumeratio systematica fungorum in omnium herbarum europaearum organis diversis hucusque observatorum mentione facta fontium litterariorum diagnoses eorum figurasque proferentium nec non praecipuorum eorum synonymorum numerorumque collectionum plurium venalium species enumeratas - Oudemans, C. A. J. A. (Cornelis Antoon Jan Abraham), 1825 -1906 (apud M. Nijhoff, 1919)