00468cam a2200181 4500 363661496 TxAuBib 20150512120000.0 150512s2014||||||||||||||||||||||||eng|u 9781610673129 1610673123 TxAuBib Rippin, Sally. Code Breakers / Rippin, Sally. Tulsa, OK : EDC, 2014. 92 pages. 20150512.