Material in the public domain. No restrictions on use.
Norton, W. H. and Lees, James H.
"Deep Wells of Iowa (A Supplementary Report) with a Chapter on Well Water Recessions in Iowa (pp.215-438),"
Iowa Geological Survey Annual Report:
Vol. 33: p. 215-438.
Available at: http://ir.uiowa.edu/igsar/vol33/iss1/4