TY  - BOOK
AU  - Ricker,William Edwin
TI  - Methods for assessment of fish production in fresh waters / 
U1  - 639.21 RIC 
PY  - 1968///
CY  - Oxford : 
PB  - Published for the International Biological Programme, by Blackwell Scientific , 
KW  - Fish populations
N1  -  Includes bibliographical references : p.270-306
ER  -