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Authorized headings		Type of heading	Records
Término temático: Construccion de tuneles used for/see from: Perforación de túneles Tuneles-construcción see also: Construcciones subterraneas (Broader heading) Excavacion de rocas (Broader heading) Excavaciones (Broader heading) Ingenieria de minas (Broader heading) Movimientos de tierras (Broader heading) Excavaciones (Narrower heading) Perforacion (Narrower heading) Perforadoras de rocas (Narrower heading) Presion de rocas (Narrower heading) Voladuras (mineria) (Narrower heading)	Details	Término temático	0 records