Geological Survey, 1982, as Hydrologic Unit Map - 1981, scale - 1:500,000. Precambrian Basement Map of the Northern Midcontinent, USA, 1990, prepared in M-14 Cooperation with the U.S. Geological Survey. USGS Map I-1853-A. Scale - 1:1,000,000. Quaternary geologic map of the Des Moines 4o x 6o Quadrangle, United States, 1991, M-15 prepared in Cooperation with the U.S. Request Geological Survey, USGS Map I-1420 Scale - 1:1,000,000. Groundwater Vulnerability Regions of Iowa, B. E. Hoyer and G. R. Hallberg, 1991, scale - M-16 1:500,000. Iowa Geological Survey Bureau Request Special Map Series II. Lithologic Cross Sections of Phanerozoic Rocks in the Northern Midcontinent, USA. M-17 Compiled by D. N. Mugel and W. P. Pratt. Request 1:100,000. USGS Map MF-1835-G. Radiometric Ages of Basement Rocks in the M-18 Northern Midcontinent, USA. Compiled by R. Request F. Marvin. 1:100,000. USGS Map MF-1835-C. Topographic map of the Platte 4o x 6o M-19 Quadrangle, USGS Map NK-14, 1959. Map Showing Distribution of Alkaline Igneous Rocks and Associated Carbonatites and M-20 Peridotites in the Northern Midcontinent, USA, Request 1991. USGS Map MF-1835-F. Topographic map of the Des Moines 4o x 6o M-21 Quadrangle, USGS Map NK-15, 1970. Bedrock Geologic Map of Iowa, 2010, B. J. M-22 Witzke, R. R. Anderson, and J. P. Pope, scale Request - 1:500,000.
Geological Survey, 1982, as Hydrologic Unit Map - 1981, scale - 1:500,000. M-14 Precambrian Basement Map of the Northern Midcontinent, USA, 1990, prepared in Cooperation with the U.S. Geological Survey. USGS Map I-1853-A. Scale - 1:1,000,000. M-15 Quaternary geologic map of the Des Moines 4o x 6o Quadrangle, United States, 1991, prepared in Cooperation with the U.S. Geological Survey, USGS Map I-1420 Scale - 1:1,000,000. Request M-16 Groundwater Vulnerability Regions of Iowa, B. E. Hoyer and G. R. Hallberg, 1991, scale - 1:500,000. Iowa Geological Survey Bureau Special Map Series II. Request M-17 Lithologic Cross Sections of Phanerozoic Rocks in the Northern Midcontinent, USA. Compiled by D. N. Mugel and W. P. Pratt. 1:100,000. USGS Map MF-1835-G. Request M-18 Radiometric Ages of Basement Rocks in the Northern Midcontinent, USA. Compiled by R. F. Marvin. 1:100,000. USGS Map MF-1835-C. Request M-19 Topographic map of the Platte 4o x 6o Quadrangle, USGS Map NK-14, 1959. M-20 Map Showing Distribution of Alkaline Igneous Rocks and Associated Carbonatites and Peridotites in the Northern Midcontinent, USA, 1991. USGS Map MF-1835-F. Request M-21 Topographic map of the Des Moines 4o x 6o Quadrangle, USGS Map NK-15, 1970. M-22 Bedrock Geologic Map of Iowa, 2010, B. J. Witzke, R. R. Anderson, and J. P. Pope, scale - 1:500,000. Request
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