Cite
MLA (8th Edition)
Bedrock Geologic Map of the Gloucester and Rockport Quadrangles, Essex County, Massachusetts. U.S. Geological Survey, For sale by U.S. Geological Survey, Map Distribution, 1992.
APA (7th Edition)
Bedrock geologic map of the Gloucester and Rockport quadrangles, Essex County, Massachusetts. (1992). U.S. Geological Survey, For sale by U.S. Geological Survey, Map Distribution.
Chicago (17th Edition)
“Bedrock Geologic Map of the Gloucester and Rockport Quadrangles, Essex County, Massachusetts.” Reston, VA: U.S. Geological Survey, For sale by U.S. Geological Survey, Map Distribution, 1992.