00930nam0-22003131i-450-990000073170403321000007317FED01000007317(Aleph)000007317FED0100000731720011111d--------km-y0itay50------baitay-------001yyCauses of blindnessamong recipients of aid to the blindBy Ralph G. Hurlin , Sadie Saffian , Carl E. Rice.WashingtonFederal security agency1947VIII, 131 p., 1 tav.ill.23 cmOcchioMalattieCecità617.7Hurlin,Ralph G.332397Rice,Carl E.Saffian,SadieITUNINARICAUNIMARCBK99000007317040332113 L 44 2620303FINBCFINBCCauses of blindness110839UNINAING01