"Photolithographed preliminary sheet for the use of the parties in the field and subject to revision.", Library's copy has separated into 2 sheets (each 82 x 60 cm.), at center fold., and Relief shown by contours and spot heights.
Publisher:
Northern Transcontinental Survey?],
Subject (Geographic):
Crazy Mountains Region (Mont.)--Maps, Topographic
Subject (Name):
Julius Bien & Co and Northern Transcontinental Survey. Topographical Dept