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Published 1878Gera, A. Reisewitz, 1878.40 p. illus. -
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Published 1961Germany : Rheinische Friedrich-Wilhelms-Universität zu Bonn, 1961.113 S ; 8. -
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Published 1928Göttingen : [Universitäts-Sternwarte zu Göttingen], 192818 p. ; 25 cm. -
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Published 1898Germany : Universität Freiburg im Breisgau, 1898.81 p. -
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Published 1921Germany : Universität im Greifswald, [1921]59 S. 8vo. -
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Published 1914Greifswald, 1914.66 p. -
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Published 1911Germany : Universität Heidelberg, 1911.104 p.