TY - JOUR AB - AU - Harold L Bischoff DA - 1974/5// DO - 10.17077/0031-0360.22893 IS - 3 VL - 55 PB - State Historical Society of Iowa PY - 1974 TI - Clayton's Silica Mine T2 - The Palimpsest UR - https://pubs.lib.uiowa.edu/palimpsest/article/id/22893/ ER -