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journal article 1926
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Smith, W.E. (author) report 1926
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journal article 1926
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journal article 1927
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Foerster, E. (author) book 1928
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Foerster, E. (author) book 1928
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journal article 1928
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Foerster, E. (author) book 1930
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report 1932
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journal article 1932