Sand and gravel extraction /

Sand and gravel extraction /

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Detalles Bibliográficos
Autor principal:	PNUMA.
Formato:	Libro
Lenguaje:	Inglés
Publicado:	Nairobi, Kenia : UN, 1990.
Colección:	Environmental management guidelines ; no.20
Materias:	ARENA GRAVA EXTRACCION IMPACTO AMBIENTAL

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