TY  - BOOK
AU  - Simpson,George Gaylord
TI  - The major features of evolution
U1  - 575 
PY  - 1961///,
PY  - 1953///
CY  - New York
PB  - Columbia University Press
KW  - Evolution (Biology)
KW  - Adoptation
KW  - Variation
KW  - Mutation
N1  - Includes bibliographical references and index
ER  -