APA Citation

Estados Unidos. Geological Survey. (1966). Ashby quadrangle, Nebraska. Washington: The Survey.

Chicago Style Citation

Estados Unidos. Geological Survey. Ashby Quadrangle, Nebraska. Washington: The Survey, 1966.

MLA Citation

Estados Unidos. Geological Survey. Ashby Quadrangle, Nebraska. Washington: The Survey, 1966.

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