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April 14, 1885 -
November 02, 1889
MERCER gained from WILLIAMS (original, extinct), lost to creation of OLIVER.
(Dak. Terr. Laws 1885, 16th sess., ch. 31, secs. 1-7/pp. 266-267; Hall, 207-208)
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February 23, 1881 -
April 14, 1885
MERCER gained from BURLEIGH and all of Non-County Area 10. Non-County Area 10 eliminated.
(Dak. Terr. Laws 1881, 14th sess., ch. 49/p. 56)
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February 10, 1879 -
February 23, 1881
MERCER lost to BURLEIGH.
(Dak. Terr. Laws 1879, 13th sess., ch. 11/pp. 18-19)
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January 14, 1875 -
February 10, 1879
MERCER created by Dakota Territory in present North Dakota from Non-County Area 1. The MERCER created 8 January 1873, with boundaries identical to PRATT (extinct), was nullified.
(Dak. Terr. Laws 1874, 11th sess., ch. 30, sec. 1/p. 71)
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