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Acting directorship, 1931-32, AFA FC EH 25
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AFA FC EH 25
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Agfa, 1936, AFA FC EH 31
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AFA FC EH 31
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Annual reports, c. 1928-31, AFA FC EH 24
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AFA FC EH 24
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Bosscha Observatory, 1938, AFA FC EH 7
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AFA FC EH 7
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Corning, 1934, AFA FC EH 32
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AFA FC EH 32
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Defense ministry, 1938, AFA FC EH 8
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AFA FC EH 8
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Eclipse committee, 1925-40, AFA FC EH 18
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AFA FC EH 18
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Enschedé, 1934-43, AFA FC EH 33
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AFA FC EH 33
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Gevaert, 1923-24, 1936, AFA FC EH 34
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AFA FC EH 34
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International Astronomical Union, 1935, 1938, AFA FC EH 9
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AFA FC EH 9
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International Education Board, 1927-28, AFA FC EH 10
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AFA FC EH 10
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Job applications, 1935-44, AFA FC EH 28
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AFA FC EH 28
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Kuiper, 1931, AFA FC EH 13
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AFA FC EH 13
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Kuiper, 1935, AFA FC EH 2
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AFA FC EH 2
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Miscellaneous correspondence, AFA FC EH 17A
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AFA FC EH 17A
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Oort, 1936-57, AFA FC EH 3
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AFA FC EH 3
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Oosterhoff, 1928-64, AFA FC EH 4
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AFA FC EH 4
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Outgoing mail, 1939-42, AFA FC EH 17
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AFA FC EH 17
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Personal correspondence, 1926, 1935, AFA FC EH 15A
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AFA FC EH 15A
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Personal requests, 1938, AFA FC EH 15
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AFA FC EH 15
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