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Berkeley, Calif. [u.a.]: Univ. of California Press, 1988
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Dubuque, Iowa: Brown, 1979
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Washington, DC: Smithonian Inst., 1965 [erschienen 1968]
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Washington, D.C.: Smithsonian Inst., 1960 [erschienen 1968]
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Washington, DC: Smithonian Inst., 1963 [erschienen 1968]
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Washington, DC: Smithonian Inst., 1964 [erschienen 1968]
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Washington, DC, 1960 ; Online-Ausg.: Chester, Vt: NewsBank, inc, 2008
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Washington, DC, 1953 ; Online-Ausg.: Chester, Vt: NewsBank, inc, 2008
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Nature Research, 2017-11-23
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Smithsonian Institution, 1990
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American Bryological and Lichenological Society, 1988
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Smithsonian Institution, 1987
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JSTOR, 1984
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American Bryological and Lichenological Society, 1984
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JSTOR, 1980
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American Bryological and Lichenological Society, 1980
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JSTOR, 1978
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American Bryological and Lichenological Society, 1978
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Smithsonian Institution, 1978
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JSTOR, 1976