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Treaties
Louisiana Purchase

Counties per Cession
Cession
Cession 398
Counties
Beaverhead, Broadwater, Deer Lodge, Gallatin, Jefferson, Lewis and Clark, Madison, Meagher, Park, Silver Bow, Park, Teton

Cession
Cession 529
Counties
Carter, Fallon, Powder River, Bowman, Grant, Mercer, Morton, Oliver, Slope, Stark, Campbell, Crook

Cession
Cession 539
Counties
Fremont, Sublette

Cession
Cession 540
Counties
Fremont, Hot Springs

Cession
Cession 597
Counties
Carter, Fallon, Powder River, Box Butte, Cherry, Dawes, Sheridan, Sioux, Butte, Custer, Fall River, Harding, Lawrence, Pennington, Campbell, Converse, Crook, Goshen, Johnson, Natrona