Published in Hedwigia, in 1921, in volume 62
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Published in Hedwigia, in 1920, in volume 61, pages 4-39
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Published in Hedwigia, in 1921, in volume 62, pages 12-37
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Published in Journal für Ornithologie, in 1857, in volume 5, pages 385-399
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Published in Hedwigia, in 1916, in volume 57, pages 266-328
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Published in Hedwigia, in 1916, in volume 57, pages 200-214
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Published in Gartenflora, in 1885, in volume 34, pages 3-9
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Published in Hedwigia, in 1920, in volume 61, pages 242-285
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Published in Hedwigia, in 1914, in volume 54, pages 283-294
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Published in Hedwigia, in 1912, in volume 51, pages 241-272
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Published in Hedwigia, in 1900, in volume 39, pages 290-320
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Published in Hedwigia, in 1917, in volume 58, pages 283-328
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Published in Hedwigia, in 1911, in volume 50, pages 1-37
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Published in Hedwigia, in 1906, in volume 45, issue 4, pages 215-238
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Published in Hedwigia, in 1914, in volume 55, pages 325-375
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