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Halle (Saale): Ampyx-Verl., 1998
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München: Blanckenstein, c 1987
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Jena: Fischer, 1937
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JSTOR, 1937
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Springer Science and Business Media LLC, 1937
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Springer Science and Business Media LLC, 1976
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University of Notre Dame, 1937
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Springer Science and Business Media LLC, 1969
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Springer Verlag, 1969
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Herzogia, 2010
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American Bryological and Lichenological Society, 1981
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JSTOR, 1981
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Springer Verlag, 1965
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Springer Science and Business Media LLC, 1965
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American Geographical Society, 1938
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Julius Springer, 1937
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Test accounts, 1936