Hutchins, T., & Cheevers, T. (1975). A new map of the western parts of Virginia, Pennsylvania, Maryland and North Carolina: Comprehending the River Ohio, and all the rivers, which fall into it; part of the River Mississippi, the whole of the Illinois River, Lake Erie; part of the Lakes Huron, Michigan &c. and all the country bordering on these lakes and rivers. [U.S. Army Corps of Engineers].
Chicago Style (17th ed.) CitationHutchins, Thomas, and T. Cheevers. A New Map of the Western Parts of Virginia, Pennsylvania, Maryland and North Carolina: Comprehending the River Ohio, and All the Rivers, Which Fall into It; Part of the River Mississippi, the Whole of the Illinois River, Lake Erie; Part of the Lakes Huron, Michigan &c. and All the Country Bordering on These Lakes and Rivers. [Washington]: [U.S. Army Corps of Engineers], 1975.
MLA (9th ed.) CitationHutchins, Thomas, and T. Cheevers. A New Map of the Western Parts of Virginia, Pennsylvania, Maryland and North Carolina: Comprehending the River Ohio, and All the Rivers, Which Fall into It; Part of the River Mississippi, the Whole of the Illinois River, Lake Erie; Part of the Lakes Huron, Michigan &c. and All the Country Bordering on These Lakes and Rivers. [U.S. Army Corps of Engineers], 1975.