  UNKNOWN SOURCE - Visible wreck charted prior to 1968. GP scaled from chart 36-47-31.39N, 76-18-12.43W. (Entered 10-7-09 KAK)
  CL1138(74), USPS; Visible wreck still visible. (Entered 10-7-09 KAK)
  CL513(93), USPS; Visible wreck shown on chart not vi