TY  - BOOK
AU  - Darwin,Charles
AU  - Darwin,Francis
TI  - The foundations of the origin of species: two essays written in 1842 and 1844 
U1  - 576.82 23
PY  - 1909///
CY  - Cambridge, Reino Unido
PB  - Cambridge University Press
KW  - Charles Darwin
KW  - Evolución
KW  - Evolution
KW  - Historia natural
KW  - Natural history
KW  - Ciencias básicas
KW  - Pure science
ER  -