00645cam a2200205 4500 100356020 TxAuBib 20070420120000.0 040501s2004||||||||||||||||||||||||eng|u 5619 Project Gutenberg PGUSA eng TxAuBib Petty, William. Essays on Mankind and Political Arithmetic [Gutenberg] / by William, Sir, 1623-1687 Petty. Project Gutenberg, 2004. Project Gutenberg. Freely available. Electronic text. Population. London (England) -- Population. http://www.gutenberg.org/license Rights