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journal article 1931
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Weinblum, Georg (author) journal article 1931
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journal article 1931
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Weitbrecht, H.M. (author) journal article 1932
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Vossnack, Ernst (author) journal article 1932
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journal article 1932
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Weinblum, Georg (author) journal article 1932
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journal article 1932
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Wagner, Herbert (author) journal article 1932
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journal article 1933
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Wagner, Herbert (author) journal article 1933
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Koch, Jacobus Johannes (author) journal article 1933
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journal article 1933
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journal article 1934
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journal article 1934
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Horn, F. (author) journal article 1935
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Wieringa, K.T. (author) journal article 1935
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journal article 1935
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journal article 1935