Operation and Maintenance of Electrical Equipment Approved for Permissibility by the Bureau of Mines

Electric Shot-firing in Mines, Quarries, and Tunnels: Volumes 240-247

Recent Articles on Petroleum and Allied Substances: Issues 2090-2119; Issues 2121-2129

Ochers and Mineral Pigments of the Pacific Northwest Occurrence: Possible Methods of Preparation, and Testing of Ochers, Siennas, and Colored Clays, Issues 301-311

Official Changes in the Active List of Permissible Explosives and Blasting Devices for September, 1929: 1929