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Fatalities at Coal Mines in September, 1922

Coal-mine Fatalities in February, 1923

Recent Articles on Petroleum and Allied Substances

Fluorspar: Its Mining, Milling, and Utilization with a Chapter on Cryolite

Conditions in the Feldspar Industry

Nonmetallic Minerals, by Raymond B. Ladoo and W.M. Myers

Nonmetallic minerals by R.B. Ladoo and W.H. Myers

Nonmetallic Minerals ... Second Edition [of the Work by R.B. Ladoo].

Non-metallic Minerals

Soapstone