1. Geologic map of the Toston quadrangle, southwestern Montana [cartographic material] Yale Public content 1967. 2012-10-03T19:07:00Z. 2013-03-18T22:21:42Z. Robinson, G. D. (Gershon Du Vall), 1918-. The Survey. English. Public. Montana, Broadwater County, and Gallatin County.