TY - RPRT TI - Hydrogeologic framework of Pennsylvanian and Late Mississippian rocks in the central lower peninsula of Michigan AU - David B. Westjohn AU - Thomas L. Weaver PY - 1996 DO - 10.3133/wri944107 UR - https://pubs.usgs.gov/publication/wri944107 ID - wri944107 ER -