Montana Atlas of Historical County Boundaries
John H. Long, Editor; Peggy Tuck Sinko, Historical Compiler; Emily Kelley, Research Associate; Laura Rico-Beck, GIS Specialist and Digital Compiler; Peter Siczewicz, ArcIMS Interactive Map Designer; Robert Will, Cartographic Assistant
Copyright The Newberry Library 2005
BIG HORN (original, see CUSTER)
CARTER (Wyo., now SWEETWATER)
CHOTEAU (see CHOUTEAU)
CHOUTEAU (created as CHOTEAU)
CLACKAMAS (Ore.)
CUSTER (created as BIG HORN, original)
EDGERTON (see LEWIS AND CLARK)
IDAHO (Idaho)
LARAMIE (Wyo.)
LEWIS AND CLARK (created as EDGERTON)
ST. CHARLES (Mo.)
ST. LOUIS (Mo.)
SHOSHONE (Idaho)
SKAMANIA (Wash.)
SPOKANE (Wash. Territory, original, extinct)
SWEETWATER (Wyo., see CARTER)
VIVION (see MUSSELSHELL, original)
WALLA WALLA (Wash.)
WASCO (Ore.)