Weller, S., & Weller, J. M. Preliminary geological maps of the pre-Pennsylvanian formations in part of southwestern Illinois: Waterloo, Kimmswick, New Athens, Crystal City, Renault, Baldwin, Chester and Campbell hill quadrangles.
Chicago Style (17th ed.) CitationWeller, Stuart, and J. Marvin Weller. Preliminary Geological Maps of the Pre-Pennsylvanian Formations in Part of Southwestern Illinois: Waterloo, Kimmswick, New Athens, Crystal City, Renault, Baldwin, Chester and Campbell Hill Quadrangles.
MLA (9th ed.) CitationWeller, Stuart, and J. Marvin Weller. Preliminary Geological Maps of the Pre-Pennsylvanian Formations in Part of Southwestern Illinois: Waterloo, Kimmswick, New Athens, Crystal City, Renault, Baldwin, Chester and Campbell Hill Quadrangles.
Warning: These citations may not always be 100% accurate.