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American Bryological and Lichenological Society, 1964
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JSTOR, 1964
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American Bryological Society, 1964
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JSTOR, 1956
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Ejnar Munksgaard, 1956
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Wiley, 1956
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Ejnar Munksgaard, 1955
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JSTOR, 1954
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Ejnar Munksgaard, 1954
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JSTOR, 1950
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Ejnar Munksgaard, 1950
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Wiley, 1951
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Wiley, 1951
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Munksgaard International Publishers Ltd., 1995
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JSTOR, 1988
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Munksgaard International Booksellers and Publishers, 1988
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JSTOR, 1985
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Munksgaard International Booksellers and Publishers, 1985
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Royal Swedish Academy of Sciences, 1974
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JSTOR, 1955