TY - RPRT TI - Benthic substrate classification map: Gulf Islands National Seashore AU - Dawn Lavoie AU - James Flocks AU - Dave Twichell AU - Kate Rose PY - 2013 DO - 10.3133/ofr20121051 UR - https://pubs.usgs.gov/publication/ofr20121051 ID - ofr20121051 ER -