TY  - BOOK
AU  - Endler,John A.
TI  - Geographic variation, speciation, and clines
T2  - Monographs in population biology
SN  - 0691081875
PY  - 1977///
CY  - Princeton, N.J.
PB  - Princeton University Press
KW  - Clines
KW  - Origin of species
N1  - Bibliography: p.187-239
ER  -