APA (7th ed.) Citation

Reynolds, M. W. (2002). Generalized bedrock geologic map of the Helena area, west-central Montana (Version 1.0, last modified 07-Aug-2002.). U.S. Dept. of the Interior, U.S. Geological Survey.

Chicago Style (17th ed.) Citation

Reynolds, Mitchell W. Generalized Bedrock Geologic Map of the Helena Area, West-central Montana. Version 1.0, last modified 07-Aug-2002. [Reston, Va.]: U.S. Dept. of the Interior, U.S. Geological Survey, 2002.

MLA (9th ed.) Citation

Reynolds, Mitchell W. Generalized Bedrock Geologic Map of the Helena Area, West-central Montana. Version 1.0, last modified 07-Aug-2002. U.S. Dept. of the Interior, U.S. Geological Survey, 2002.