APA (7th ed.) Citation

United States. Bureau of Mines. (1921). Investigation of low-grade and complex ores in Colorado. [publisher not identified].

Chicago Style (17th ed.) Citation

United States. Bureau of Mines. Investigation of Low-grade and Complex Ores in Colorado. [Washington]: [publisher not identified], 1921.

MLA (9th ed.) Citation

United States. Bureau of Mines. Investigation of Low-grade and Complex Ores in Colorado. [publisher not identified], 1921.

Warning: These citations may not always be 100% accurate.