APA (7th ed.) Citation

Harbour, R. L., & Dixon, G. H. (1959). Coal resources of Trinidad-Aguilar area, Las Animas and Huerfano Counties, Colorado. United States Department of the Interior, Geological Survey.

Chicago Style (17th ed.) Citation

Harbour, R. L., and G. H. Dixon. Coal Resources of Trinidad-Aguilar Area, Las Animas and Huerfano Counties, Colorado. Washington, D.C.: United States Department of the Interior, Geological Survey, 1959.

MLA (9th ed.) Citation

Harbour, R. L., and G. H. Dixon. Coal Resources of Trinidad-Aguilar Area, Las Animas and Huerfano Counties, Colorado. United States Department of the Interior, Geological Survey, 1959.