APA (7th ed.) Citation

Geological Survey (U.S.) & ProQuest (Firm). (1916). Bulletin 631. The Yukon-Koyukuk region, Alaska. [publisher not identified].

Chicago Style (17th ed.) Citation

Geological Survey (U.S.) and ProQuest (Firm). Bulletin 631. The Yukon-Koyukuk Region, Alaska. Washington: [publisher not identified], 1916.

MLA (9th ed.) Citation

Geological Survey (U.S.) and ProQuest (Firm). Bulletin 631. The Yukon-Koyukuk Region, Alaska. [publisher not identified], 1916.

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