
 HISTORY
  CL1768/68--USPS REPORT, 10/25/68; ONE OF THREE MARKERS MOUNTED ì
ON PIPES, INSTALLED BY THE COE TO MARK SAMPLING STUDIES BY THE ì
STATE OF TEXAS. REPORTED 10FT OF PIPE EXPOSED. POSITION GIVEN ON ì
GRAPHIC IS LAT.29-22-59N, LONG.94-50-59W (N