Statement of Disassociation, 1957

Annual Reports

Articles of Incorporation (Roundup), 1927

Articles of Incorporation (Butte), 1906

"Fire in the Hole: Slovenians, Croatians, and Coal Mining on the Musselshell" Anna Zellick, in Montana: The Magazine of Western History, Spring 1990.

R. W. Richards, "The Central Part of the Bull Mountain Coal Field, Montana," Contributions to Economic Geology, 1908, US Geological Survey, US Gov. Printing Office, 1910.

Maurice Campbell, "Contributions to Economic Geology, 1908," US Geological Survey [Full Volume].