Geological Survey (U.S.) & United States. Soil Conservation Service. (1993). 1:100 000-scale metric topographic map of Chicago, Illinois-Indiana-Michigan, 1980: 30 x 60 minute series (topographic). The Survey.
Chicago Style (17th ed.) CitationGeological Survey (U.S.) and United States. Soil Conservation Service. 1:100 000-scale Metric Topographic Map of Chicago, Illinois-Indiana-Michigan, 1980: 30 X 60 Minute Series (topographic). Reston, Va.: The Survey, 1993.
MLA (9th ed.) CitationGeological Survey (U.S.) and United States. Soil Conservation Service. 1:100 000-scale Metric Topographic Map of Chicago, Illinois-Indiana-Michigan, 1980: 30 X 60 Minute Series (topographic). The Survey, 1993.
Warning: These citations may not always be 100% accurate.