TY - RPRT TI - Preconstruction and postconstruction ground-water levels, Lock and Dam 5 and 6, Red River Valley, Louisiana AU - A. H. Ludwig AU - J. E. Terry PY - 1979 DO - 10.3133/ofr79922 UR - https://pubs.usgs.gov/publication/ofr79922 ID - ofr79922 ER -