TY  - BOOK
AU  - Darwin,Charles
TI  - On natural selection
SN  - 9780141018966
U1  - 576.8/2 22
PY  - 2005///
CY  - New York
PB  - Penguin Books
KW  - Evolution (Biology)
KW  - Natural selection
N1  - "This extract first published in Penguin Books (U.K.) 2004."--T.p. verso; "Taken from the Penguin Classics edition of The origin of Species, edited by J.W. Burrow"--T.p. verso; Struggle for existence -- Natural selection -- Difficulties on theory -- Conclusion
UR  - http://www.loc.gov/catdir/enhancements/fy1204/2005047448-d.html
UR  - http://www.loc.gov/catdir/enhancements/fy1204/2005047448-s.html
UR  - http://www.loc.gov/catdir/enhancements/fy1204/2005047448-t.html
ER  -