APA (7th ed.) Citation

Mapel, W. J., & Dean, B. W. (1976). Preliminary geologic map and coal sections, Ulm quadrangle, Sheridan County, Wyoming. The Survey.

Chicago Style (17th ed.) Citation

Mapel, W. J., and B. W. Dean. Preliminary Geologic Map and Coal Sections, Ulm Quadrangle, Sheridan County, Wyoming. Reston, Va.: The Survey, 1976.

MLA (9th ed.) Citation

Mapel, W. J., and B. W. Dean. Preliminary Geologic Map and Coal Sections, Ulm Quadrangle, Sheridan County, Wyoming. The Survey, 1976.