 HISTORY
  LNM10/90--9TH CGD, 11/9/90; REFERS TO BP138293, ADD UNKNOWN OBSTRUCTION 11FT IN POS. 42 33 05.7N, 082 35 28W.
  BP138293/90--1990 USACE SURVEY SWEEP SURVEY
  H11913: OPR-W408-NRT4-08; AWOIS #10701 not investigated during this survey.  (Upda