The production of asphalt, related bitumens and bituminous rock in 1913.
- Washington, D.C. Government Printing Office 1914
- pp. 537-544
- Mineral Resources of the United States, calendar year 1913-Part II .
Impreso
Ingles
MINERIA ASFALTO BETUN
PRODUCCION DE ASFALTO BETUNES SOLIDOS ROCAS BETUMINOSAS