1. Geologic and structure contour map of the Fort Peck Indian reservation and vicinity, Montana [cartographic material] Yale Public content 1956. 2012-08-28T19:03:31Z. 2013-03-18T22:15:30Z. Colton, Roger B. (Roger Burnham), 1924-. The Survey. English. Public. Montana and Fort Peck Indian Reservation.