
 HISTORY
  UNKNOWN SOURCE--TWO SETS OF RUINS APPEARED ON FIRST EDITION ì
(DATED 1971) OF CHART 11317 (522). POSITION SCALED AT MIDPOINT ì
BETWEEN RUINS ON CHART 11317 (1:50,000). POSITION: LAT. ì
28-33-47N, LONG. 96-32-31W (ENT GM 12/87)
  H10381/91-