TY  - BOOK
AU  - J.A. Gulland
TI  - Manual of Methods for fisheries Resource Survey and Appraisal part5- Objective s and Basic Methods
T2  - FAO Fisheries Technical Paper No
SN  - 9251001189
U1  - 639.2 
PY  - 1975///
CY  - Rome
PB  - FAO of the United Nations
ER  -