TY  - BOOK
ED  - United Nations Environment Programme
TI  - Sand and gravel extraction projects
T2  - Environmental management guidelines
PY  - 1990///
CY  - Nairobi, Kenya
PB  - The Programme
KW  - United Nations
KW  - Environmental policy
KW  - Periodicals
KW  - Sand and gravel plants
KW  - Environmental aspects
N1  - Title from cover
ER  -