TY - RPRT TI - Map showing nature of shallow subsurface sediments and biogeology in the Port Isabel 1 degree x 2 degrees quadrangle, Texas AU - H. L. Berryhill AU - A. R. Trippet PY - 1980 DO - 10.3133/i1254c UR - https://pubs.usgs.gov/publication/i1254C ID - i1254C ER -