Data base map / by James P. Engfer and John M. Rongstad. 1991
Bedrock geology map / by Charles E. Broste and John M. Rongstad. 1991
Bedrock topography map / by John M. Rongstad and Jesse D. Wohlfeil. 1991
Depth to bedrock map / by Charles E. Broste and Jesse D. Wohlfeil. 1991
Bedrock aquifer map / by John M. Rongstad and Thomas E. Kujawa. 1991
Glacial aquifer map / by Charles E. Broste, Cis A. Berg and John M. Rongstad. 1991.