TY  - BOOK
AU  - Tivy, Joy
AU  - O'Hare Greg
TI  - Human impact on the ecosystem
SN  - 9780050032039
AV  - GF75 .T58 1990
PY  - 1990///
CY  - Edinburgh
PB  - Oliver and Boyd
KW  - Ecosystem
KW  - Ecology
N1  - includes bibliographical reference and  index
ER  -