LEADER 00598oam 2200181z- 450 001 9910693668803321 035 $a(CaSebORM)01120100004SI 035 $a(CKB)4100000011375903 035 $a(EXLCZ)994100000011375903 100 $a20230516c2001uuuu -u- - 101 0 $aeng 200 10$aInvisible cryptologists : African Americans, WWII to 1956 210 $aFort George G. Meade, Md$cCenter for Cryptologic History, NSA 517 $aInvisible Cryptologists 906 $aBOOK 912 $a9910693668803321 996 $aInvisible cryptologists : African Americans, WWII to 1956$93196144 997 $aUNINA