TY - JOUR AB - AU - Samuel Calvin DA - 1895/1// DO - 10.17077/2160-5270.1302 IS - 1 VL - 3 PB - Iowa Geological Survey PY - 1895 TI - Report of the State Geologist T2 - Iowa Geological Survey Annual Report UR - https://pubs.lib.uiowa.edu/igsar/article/id/1072/ ER -