Un informe t cnico detallado realizado por un ingeniero jefe que analiza la cuenca carbon fera de Val-de-Ari o en la provincia de Teruel. Un libro til para la comprensi n de la industria minera y su impacto en la econom a en el siglo XX. This work has been selected by scholars as being culturally important, and is part of the knowledge base of civilization as we know it. This work is in the "public domain in the United States of America,...