Minerals
Our mineral supplies. H. D. McCaskey, and E. F. Burchard. (U.S. Geological survey. Bul. 666) 278p pa ’19
Mines and mining
A glossary of the mining and mineral industry. Albert H. Fay. (U.S. Mines bureau. Bul. 95) 754p pa ’20
Mining laws
State mining laws on the use of electricity in and about coal mines. L. C. Ilsley. (U.S. Mines bureau. Technical paper 271) 53p pa ’20
Mortality
Mortality statistics, 1918. 19th annual report. (U.S. Census bur.) 603p pa ’20
Motion pictures
Motion pictures and motion picture equipment; a handbook of general information. F. W. Reynolds and Carl Anderson. (U.S. Education bureau. Bul. 1919, no. 82) 16p pa ’20