00761cam a2200217 4500 425500424 TxAuBib 20170519120000.0 991201s1999||||||||||||||||||||||||eng|u 2009 Project Gutenberg PGUSA eng TxAuBib Darwin, Charles, 1809-1882. The Origin of Species by Means of Natural Selection [Gutenberg] : Or, the Preservation of Favoured Races in the Struggle for Life, 6th Edition / Charles Darwin. Project Gutenberg, 1999. See also PG#1228 for the First Edition. Public domain in the USA. Text. Natural selection. Evolution (Biology.) http://www.gutenberg.org/ebooks/2009 TXGID