APA (7th ed.) Citation

Geological Survey (U.S.) & ProQuest (Firm). (1912). [Geological Survey professional paper 71; Index to stratigraphy of North America, pt. 1]. [publisher not identified].

Chicago Style (17th ed.) Citation

Geological Survey (U.S.) and ProQuest (Firm). [Geological Survey Professional Paper 71; Index to Stratigraphy of North America, Pt. 1]. Washington: [publisher not identified], 1912.

MLA (9th ed.) Citation

Geological Survey (U.S.) and ProQuest (Firm). [Geological Survey Professional Paper 71; Index to Stratigraphy of North America, Pt. 1]. [publisher not identified], 1912.

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