Wilbert Smith Archives Files Box 1136 13 1136-13-p018

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_POR-SECRET Con FipemTal DEPARTMENT OF TRANSPORT 7 INTRA-OCPARTMENTAL CORRESPONDENCE, * |. 3 EOLA Ds oat ruce ‘ one oun rue Goo-Magnetics =}! ek (2.87. te = ry i SS =e | sumer ‘ — aoe co! nee | FEE COWTROLIGR OF TRLZCONUNICATIONS ¢ iE tra © ? of a For ths past several years wo have been engeged in the nae various uspecte of radio weve propagetion. Ths vagaries of this i on have Led us into tho fields of aurora, ccemic radietion, atnospha: c r2dio-activity @ud geo-magnetism. In the ceeo of...