semiburied structures. These structures walls designed ta retain portions of the (sll on (he psi and greater, were exposed to uverpressures ot 1} l wood sheaining generally 3, Small buildings covered with thin sheet metal over diagona e of this type was observed structur one , However withstood overpressures up to 5 and 6 psi. badly damaged by an overpressure of 44 gst. tly aheathed only with torruvated metas 4. Lightly conatructed wood-fe>me shacks apparen 4 pai were completely destrosed. No than greater ssures overpre and located in regions with d to less thin 4 pol overpressure. subjecte siractureb uf Wiis type were observed in regions of 4 tu 9 psi and greater, but 5. Palm trees were destroyed by air-blast overpreseures PSSTMESTFALE RRRLI than ¢ pat. none were Gesrroyed by overpressures seus $9 "reaEE SECRET — RESTRICTED DATA et T EE IATLLE TELS Oe IeIES: CRE y ro FREae Re PREPSRIA Re RT . pope . sy as vo 2 se, +, ”