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Sand and gravel extraction projects /

Sand and gravel extraction projects / United Nations Environment Programme. - Nairobi, Kenya : The Programme, 1990. - 37 p. - Environmental guidelines ; no. 20 . - Environmental management guidelines ; no. 20 .

Title from cover.

LCCN: 90043089

Subjects--Corporate Names:
United Nations--Environmental policy--Periodicals.

Subjects--Topical Terms:
Environmental policy--Periodicals.
Sand and gravel plants--Environmental aspects.