TY - RPRT TI - Effects of hardened low-water crossings on stream habitat, water quality, and periphyton in four streams at the Fort Polk Military Reservation, Vernon Parish, Louisiana, October 1998 through November 1999 AU - Roland W. Tollett AU - Barbara W. Bryan AU - C. Fredrick Bryan PY - 2002 DO - 10.3133/wri024291 UR - https://pubs.usgs.gov/publication/wri024291 ID - wri024291 ER -