APA (7th ed.) Citation

Geological Survey (U.S.) & ProQuest (Firm). (1917). Bulletin 641. Contributions to economic geology (short papers and preliminary reports). 1916. [publisher not identified].

Chicago Style (17th ed.) Citation

Geological Survey (U.S.) and ProQuest (Firm). Bulletin 641. Contributions to Economic Geology (short Papers and Preliminary Reports). 1916. Washington: [publisher not identified], 1917.

MLA (9th ed.) Citation

Geological Survey (U.S.) and ProQuest (Firm). Bulletin 641. Contributions to Economic Geology (short Papers and Preliminary Reports). 1916. [publisher not identified], 1917.

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