- document
- journal article 1926
- document
- journal article 1925
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- journal article 1925
- document
- Schaffran, K. (author) journal article 1925
- document
- Schepers, J.A. (author) journal article 1924
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- journal article 1924
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- journal article 1924
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- Hogner, Einar (author) journal article 1923
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- journal article 1923
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- journal article 1922
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- journal article 1921
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- journal article 1920
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- journal article 1919
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- journal article 1919
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- Schaffran, K. (author) journal article 1915
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- Isherwood, J.W. (author) journal article 1910