TY  - GEN
AU  - Darwin, Charles
TI  - On natural selection
SN  - 9780141018966
U1  - 576.82 
PY  - 2004///
CY  - London
PB  - Penguin Books Ltd.
KW  -  
N1  - CONTENTS
Struggle for Existence I
Natural Selection 20
Difficulties on Theory    72
Conclusion  108
ER  -