TY  - GEN
AU  - United Nations Environment Programme
PY  - 1990
UR  - https://wedocs.unep.org/handle/20.500.11822/29053
LA  - English
KW  - river
KW  - seabed resource
KW  - information need
KW  - environmental monitoring
KW  - mining
KW  - seabed mining
KW  - environmental degradation
KW  - sand extraction
KW  - gravel extraction
TI  - Environmental Guidelines for Sand and Gravel Extraction Projects - Environmental Management Guidelines, No. 20
M3  - Communication or other resource
ER  -