You searched for: Institution University of Michigan. Libraries Remove constraint Institution: University of Michigan. Libraries Place Big Horn Mountains; between Baby Wagon & Virginia Creek, ca 4 air mi NW of Powder River Pass, ca 24.5 air mi SW of Buffalo. Remove constraint Place: Big Horn Mountains; between Baby Wagon & Virginia Creek, ca 4 air mi NW of Powder River Pass, ca 24.5 air mi SW of Buffalo.