TY  - BOOK
AU  - Slobodchikoff C N Ed.
TI  - Concepts of species
T2  - Benchmark papers in systematic and evolutionary biology; 3
U1  - G:66, L63 
PY  - 1976///
CY  - Strovdsburg
PB  - Dowden, Eutchinson and Ross
KW  - Evolution
ER  -