TY  - BOOK
AU  - Strain B.R 
AU  - W.D.Billings 
TI  - Vegetation and environment 
SN  - 9061931878
U1  - 581.7 STR  
PY  - 1974///
CY  - Netherlands 
PB  - Publishers - The Hague 
KW  - Environment
ER  -