{ 0 (1300) _~—Ssé&Ftg. 3: Sr°° surface Air Concentration 700 a 600-— | ¢ Kodiak, Alaska Llp ¢ Port Lyautey, F.M. { + Yokosuka, Japan ; 500}+-— Li S | 300;-— >» o H 200}— = | Oo ! | ’ \OO}-— 0 | ° @ o ; ‘ ,t4 ¢ ' eo e Pre et rrvT rrr ryt rrr tT PTT 1954 1953 1952 t, { : t 4 f Ky TT ttt 1955