TY - JOUR AB - AU - G. E. Patrick DA - 1895/1// DO - 10.17077/2160-5270.1304 IS - 1 VL - 3 PB - Iowa Geological Survey PY - 1895 TI - Report of Prof. G. E. Patrick T2 - Iowa Geological Survey Annual Report UR - https://pubs.lib.uiowa.edu/igsar/article/id/1071/ ER -