United States. Congress. Senate. Committee on Mines and Mining & ProQuest (Firm). (1940). Providing for the establishment and maintenance of an assay office at Helena, Mont. [publisher not identified].
Chicago Style (17th ed.) CitationUnited States. Congress. Senate. Committee on Mines and Mining and ProQuest (Firm). Providing for the Establishment and Maintenance of an Assay Office at Helena, Mont. Washington: [publisher not identified], 1940.
MLA (9th ed.) CitationUnited States. Congress. Senate. Committee on Mines and Mining and ProQuest (Firm). Providing for the Establishment and Maintenance of an Assay Office at Helena, Mont. [publisher not identified], 1940.
Warning: These citations may not always be 100% accurate.