Sectional map of the state of Iowa, compiled from the United States surveys also exhibiting the internal improvements, distances between towns & villages, lines of projected rail roads &c. &c.; drawn and published by Guy H. Carleton, Dep. Sur. U.S.
Skunk River Basin Maps including information on alluvial and buried channel aquifiers; depth to bedrock; quaternary isopach; median nitrate concentration for sample centers and shallow bedrock areas.