 UNKNOWN SOURCE--PILE FIRST APPEARED ON 1964 ED. OF CHART 12222.               
CL751/78--USPS; REVISED TO SUBM. PILE ON 1978 ED. OF CHART 12222.             
MAR--7/84,OPR-D103-PE-84(CL1206/84);400% SIDE SCAN COVERAGE FOR A
 250M RADIUS CIRCLE NORTH