TY  - GEN
AU  - Ager,Derek V.
TI  - Principles of paleoecology : : an introduction to the study of how and where animals and plants lived in the past
T2  - International series in the earth sciences
U1  - 560.45 21
PY  - 1963///
CY  - London ; , New York : 
PB  - McGraw-Hill, 
ER  -