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October 01, 1879 -
November 02, 1889
McCOOK gained from DAVISON and HANSON.
(Dak. Terr. Laws 1879, 13th sess., ch. 12/pp. 20-27)
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January 08, 1873 -
October 01, 1879
McCOOK created by Dakota Territory in present South Dakota from HANSON.
(Dak. Terr. Laws 1872, 10th sess., ch. 16, sec. 15/p. 34)
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