Cite
MLA (8th Edition)
Bedrock Geologic Map of the St. Louis 30ʹ x 60ʹ Quadrangle, Missouri and Illinois. The Survey, For sale by Map Distribution, 1997.
APA (7th Edition)
Bedrock geologic map of the St. Louis 30ʹ x 60ʹ quadrangle, Missouri and Illinois. (1997). The Survey, For sale by Map Distribution.
Chicago (17th Edition)
“Bedrock Geologic Map of the St. Louis 30ʹ x 60ʹ Quadrangle, Missouri and Illinois.” Reston, VA: The Survey, For sale by Map Distribution, 1997.