Atlantic 1 
richfield 
 
Arco logo

Atlantic Refining (1916-1968) and Richfield Oil of California (1924-1968) merged in 1968 to become the Atlantic-Richfield Oil Company also known as ARCO.  Atlantic- RIchfield existed from 1969 until 1987.
Maps with years in red are not in my collection - scans of covers have been provided by other collectors.
 65 Atlantic Cover Icon
1965
 66 Atlantic Cover Icon
1966
67 Atlantic Cover Icon
1967
69 Atlantic Cover Icon 
1969
 
 
 
  
 
 
70 Arco Cover Icon
1970
 
 
 
 
 
 
71 Arco Cover Icon
1971