
 HISTORY
  CL552/78--CAS18661(1977)-OPR-511-DA-77-ITEM 11, (BP103691); ì
VISIBLE WK (COV WITH TREES AND VEGETATION) POSITION SCALED FROM ì
BLUEPRINT IN LAT 38-00-44.0N, LONG 121-43-27.0W(NAD27).
  TP01059/79--REV-CLASS III; VISIBLE WK (APPROX 40M LON