APA (7th ed.) Citation

Willden, R., & Carlson, J. E. (1968). Transcontinental geophysical survey (35⁰-39⁰ N): Geologic map from 87⁰ to 100⁰ W longitude. U.S. Geological Survey.

Chicago Style (17th ed.) Citation

Willden, Ronald, and John Edward Carlson. Transcontinental Geophysical Survey (35⁰-39⁰ N): Geologic Map from 87⁰ to 100⁰ W Longitude. Washington, D.C.: U.S. Geological Survey, 1968.

MLA (9th ed.) Citation

Willden, Ronald, and John Edward Carlson. Transcontinental Geophysical Survey (35⁰-39⁰ N): Geologic Map from 87⁰ to 100⁰ W Longitude. U.S. Geological Survey, 1968.