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contribution to periodical 1938
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journal article 1938
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contribution to periodical 1939
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journal article 1939
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journal article 1939
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contribution to periodical 1940
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journal article 1940
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journal article 1940
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journal article 1941
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Knapp, R.T. (author) report 1941
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contribution to periodical 1941
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journal article 1942
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contribution to periodical 1942
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contribution to periodical 1943
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Evers, H. (author) book 1943
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Vrijlandt, W. (author) book 1943
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journal article 1943
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contribution to periodical 1944
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journal article 1944
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contribution to periodical 1945