Osborne, W. E. (1992). Bedrock geology of the Cahaba Valley area between Helena and Lake Purdy, Shelby and Jefferson counties, Alabama. Geological Survey of Alabama.
Chicago Style (17th ed.) CitationOsborne, W. Edward. Bedrock Geology of the Cahaba Valley Area Between Helena and Lake Purdy, Shelby and Jefferson Counties, Alabama. Tuscaloosa, Ala.: Geological Survey of Alabama, 1992.
MLA (8th ed.) CitationOsborne, W. Edward. Bedrock Geology of the Cahaba Valley Area Between Helena and Lake Purdy, Shelby and Jefferson Counties, Alabama. Geological Survey of Alabama, 1992.
Warning: These citations may not always be 100% accurate.