TY  - BOOK
AU  - Ravera, O, ed
TI  - Ecological assessment of environmental degradation pollution and recovery: lectures of a course held at the joint research centre, Ispra( Italy) 12-16 October 1987
U1  - 363.73 R196E 
PY  - 1989///
CY  - Amsterdam
PB  - Elserier
ER  -