TY - RPRT TI - Geologic environment of the Van Norman Reservoirs area AU - R. F. Yerkes AU - M. G. Bonilla AU - T. L. Youd AU - J.D. Sims PY - 1974 DO - 10.3133/cir691a UR - https://pubs.usgs.gov/publication/cir691A ID - cir691A ER -