 HISTORY
  CL1497/70--USPS; VISIBLE WK PA, SCALED FROM CHART IN LAT ì
27-49-17.5N, LONG 97-11-38W.
  CL970/72--USPS; NOT VISIBLE, CHART REVISED TO SUBM WK PA. (ENT ì
SRB 2/88)
  H10364/90-91-- OPR-K229-AHP; TRIANGULAR SHAPED OBSTRUCTION, 10 ì
METER