Report issued by the U.S. Bureau of Mines on the air quality in metal-mines after using wet drills. Dust samples are collected and compared to samples collected from similar metal-mines in South Africa and Australia. This report includes tables.
Report issued by the U.S. Bureau of Mines on the oil-shale operations at New South Wales, Australia in 1947. The methods, and types of equipment used are presented. The report includes maps, photographs, and illustrations of the oil-shale refinery.
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