TY  - BOOK
AU  - Mayr,Ernst
TI  - Populations, species, and evolution: an abridgment of Animal species and evolution 
SN  - 0674690133
AV  - QH371 .M33 1970
PY  - 1970///
CY  - Cambridge, Mass.
PB  - Belknap Press of Harvard University Press
KW  - Species
KW  - Animals
KW  - Variation
KW  - Evolution
N1  - includes bibliographical references and index
ER  -