TY  - BOOK
AU  - Emlen,John Merritt
TI  - Ecology: an evolutionary approach
T2  - Addison-Wesley series in life sciences 
U1  - 574.5  
PY  - 1973///]
CY  - Reading, Mass.
PB  - Addison-Wesley Pub. Co.
KW  - Ecology.
N1  - Includes bibliographies.
ER  -