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February 28, 1901 -
LASSEN exchanged with PLUMAS
Calif. Stats. 1901, 34th sess., ch. 61/pp. 76-80
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March 14, 1899 -
February 28, 1901
LASSEN gained from SHASTA
Calif. Stats. 1899, 33rd sess., ch. 82/p. 98
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March 16, 1874 -
March 14, 1899
LASSEN lost small area to SIERRA when boundary was set on public land survey lines.
Calif. Stats. 1873, 20th sess., Acts Amendatory of the Codes, p. 166
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January 01, 1873 -
March 16, 1874
LASSEN gained from PLUMAS
Political Code 1872, 1: secs. 3912, 3920/pp. 115-116, 122-123
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April 01, 1864 -
January 01, 1873
LASSEN created from both PLUMAS and SHASTA
Calif. Stats. 1863-1864, 15th sess., ch. 261/pp. 264-269
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