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401
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402
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403
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404
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405
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406
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407
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408
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409
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410Herdruk uit de Monthly Labor Review, april 1943“… Bulletin of the United States Bureau of Labor Statistics, 740…”
Date 1943
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411Herdruk uit Agricultural History, vol. 36, no 2, p. 59-81
By Chambers, Clarke A., Kohlmeyer, Fred W.
Date 1962 -
412
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413“…The Pelican History of the United States, 7…”
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414
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415
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416
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417
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418
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419
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