Report issued by the U.S. Bureau of Mines on experiments conducted to improve the cab conditions of freight engines. The temperature, gas content, and other properties are presented. This report includes tables, graphs, and illustrations.

Report issued by the U.S. Bureau of Mines on the possibilities of applying oxygenated air during metallurgical and allied processes. The methods and results of applying oxygenated air to these processes are presented. This report includes tables and graphs.

Report issued by the U.S. Bureau of Mines detailing the laboratory-scale tests of the efficiency of the Trent process in cleaning coal, in which powdered coal, water, and oil is agitated or beaten together to remove impurities. The report includes details in tables detailing the efficiency varying the type and amounts of coal, oil, and water on the process.

Report discussing "the extent and nature of the hazards to firefighters from gases and smoke resulting from the application of carbon tetrachloride extinguisher to electric arcs, burning insulation or fires such as may occur in electrical apparatus and machinery. The experiments described were made for the purpose of determining the nature of gases and smoke and ascertaining their toxic properties" (p. 1).