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Publisher
- Iowa Geological Survey7
- Iowa Dept. of Natural Resources5
- The Survey3
- The Bureau2
- The Department2
- A.J. Johnson,P.W. Wyckoff1
- National Highways Association,A. Hoen & Co.1
- National Highways Association,Natl Litho. Co.1
- Published by Dyer & Pasmore, Milwaukee, Wisconsin1
- Published by Mills & Co.1
- Robbins, Safford & Co.1
- Silas Chapman1
- The Dept1
