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April 04, 1854 -
MERCER gained from CRAWFORD.
(Pa. Laws 1854, no. 255, sec. 1/p. 279)
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September 01, 1849 -
April 04, 1854
MERCER lost to creation of LAWRENCE.
(Pa. Laws 1849, no. 366, secs. 1-2/pp. 551-552)
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March 28, 1808 -
September 01, 1849
MERCER lost to CRAWFORD.
(Pa. Stat., ch. 3008, sec. 1/18:909-910)
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March 12, 1800 -
March 28, 1808
MERCER created from ALLEGHENY.
(Pa. Stat., ch. 2130, pp. 455-456, 460-461)
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