APA (7th ed.) Citation

(1968). Preliminary geologic map of the Roberts Mountain quadrangle, Lewis and Clark county, Montana. U.S. Geological Survey.

Chicago Style (17th ed.) Citation

Preliminary Geologic Map of the Roberts Mountain Quadrangle, Lewis and Clark County, Montana. Washington, D.C: U.S. Geological Survey, 1968.

MLA (9th ed.) Citation

Preliminary Geologic Map of the Roberts Mountain Quadrangle, Lewis and Clark County, Montana. U.S. Geological Survey, 1968.

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