TY  - BOOK
AU  - Mayr, Ernst 
TI  - Populations, Species and Evolution
SN  - 0674690109
AV  - QH371 .M33 1970  
PY  - 1970///
CY  - Cambridge, Mass. : 
PB  - Belknap Press of Harvard University Press
KW  - Animals -- Variation
KW  - Evolution
KW  - Species
ER  -