APA (7th ed.) Citation

Johnson, R. B. (1969). Geologic map of the Trinidad quadrangle, south-central Colorado. Interior--Geological Survey.

Chicago Style (17th ed.) Citation

Johnson, Ross B. Geologic Map of the Trinidad Quadrangle, South-central Colorado. Washington: Interior--Geological Survey, 1969.

MLA (9th ed.) Citation

Johnson, Ross B. Geologic Map of the Trinidad Quadrangle, South-central Colorado. Interior--Geological Survey, 1969.

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