APA (7th ed.) Citation

Geological Survey (U.S.) & ProQuest (Firm). (1924). Department of the Interior Hubert Work, Secretary U. S. Geological Survey George Otis Smith, Director Professional Paper 138. Mining in Colorado. A History of Discovery, Development and Production. [publisher not identified].

Chicago Style (17th ed.) Citation

Geological Survey (U.S.) and ProQuest (Firm). Department of the Interior Hubert Work, Secretary U. S. Geological Survey George Otis Smith, Director Professional Paper 138. Mining in Colorado. A History of Discovery, Development and Production. Washington: [publisher not identified], 1924.

MLA (9th ed.) Citation

Geological Survey (U.S.) and ProQuest (Firm). Department of the Interior Hubert Work, Secretary U. S. Geological Survey George Otis Smith, Director Professional Paper 138. Mining in Colorado. A History of Discovery, Development and Production. [publisher not identified], 1924.