Cite

Topographic sheet, Montana (Silver Bow Co.) : Butte special map / Henry Gannett, chief topographer ; E.M. Douglas, topographer in charge ; triangulation and topography by R.H. Chapman.

MLA

Geological Survey (U.S.). Topographic sheet, Montana (Silver Bow Co.) : Butte special map / Henry Gannett, chief topographer ; E.M. Douglas, topographer in charge ; triangulation and topography by R.H. Chapman.. BRBL_00581. [1897]. https://collections.library.yale.edu/catalog/15818311.

APA, 6th edition

Geological Survey (U.S.). (["BRBL_00581"])([1897])[Topographic sheet, Montana (Silver Bow Co.) : Butte special map / Henry Gannett, chief topographer ; E.M. Douglas, topographer in charge ; triangulation and topography by R.H. Chapman.]. https://collections.library.yale.edu/catalog/15818311.