books.google.com - Archaic Bookkeeping brings together the most current scholarship on the earliest true writing system in human history. Invented by the Babylonians at the end of the fourth millennium B.C., this script, called proto-cuneiform, survives in the form of clay tablets that have until now posed formidable barriers...http://books.google.com/books/about/Archaic_Bookkeeping.html?id=YBAzXV4YtQ8C&utm_source=gb-gplus-shareArchaic Bookkeeping
