00600cam a2200181 4500 424332522 TxAuBib 20090706120000.0 120402t20061981||||||||||||||||||||eng|u STPB STPB TxAuBib Skousen, W Cleon. The 5000 year leap : the 28 great ideas that changed the world / W. Cleon Skousen. USA : National Center for Constitutional Studies, 1981. ©2006. 337 p : ill ; 21 cm. Paperback. 20090706.