  H7028/45-50WD-- PBS-2150WD; 1:40,000-SCALE SURVEY; 42-FOOT CLEARED DEPTH IN POS. LAT. 36-57-36N, LONG. 76-00-30W.
  H9871/76WD-- SWEPT IN ONE DIRECTION TO 38 FEET.
  H9901/80-- OPR-D103-PE-80; 1:10,000-SCALE SURVEY; ARGO R/R CONTROL; ECHO SOUNDER; SU