00458cam a2200157 4500 612765296 TxAuBib 20091111120000.0 091111s1952||||||||||||||||||||||||eng|u TxAuBib Simonson, Roy W. Understanding Iowa Soils / Simonson, Roy. Dubuque, IA : Wm. C. Brown, 1952. 20091111. State of Iowa History.