TY  - BOOK
AU  - Yapp, W. B.
AU  - Watson, D.
ED  - Institute of Biology
TI  - The biological productivity of Britain
U1  - 338.10942 
PY  - 1958///
CY  - London
PB  - The Institute of Biology
KW  - Agriculture
KW  - Economic aspects
KW  - Great Britain
N1  - Includes bibliographical references
ER  -