APA (7th ed.) Citation

Geological Survey (U.S.) & ProQuest (Firm). (1907). Contributions to economic geology 1906. [publisher not identified].

Chicago Style (17th ed.) Citation

Geological Survey (U.S.) and ProQuest (Firm). Contributions to Economic Geology 1906. Washington: [publisher not identified], 1907.

MLA (9th ed.) Citation

Geological Survey (U.S.) and ProQuest (Firm). Contributions to Economic Geology 1906. [publisher not identified], 1907.

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