Geological Survey (U.S.), Cannon, W. F., & McGervey, T. A. (1991). Map showing mineral deposits of the midcontinent rift, Lake Superior region, United States and Canada. The Survey.
Chicago Style (17th ed.) CitationGeological Survey (U.S.), William F. Cannon, and Teresa A. McGervey. Map Showing Mineral Deposits of the Midcontinent Rift, Lake Superior Region, United States and Canada. Reston, Va.: The Survey, 1991.
MLA (9th ed.) CitationGeological Survey (U.S.), et al. Map Showing Mineral Deposits of the Midcontinent Rift, Lake Superior Region, United States and Canada. The Survey, 1991.
Warning: These citations may not always be 100% accurate.