The Online Books Page

Books by F. P. Christofel:

Books in the extended shelves:

• Christofel, F. P.: Experiments on multiple short-delay blasting of coal (in two parts) : part II (U.S. Dept. of the Interior, Bureau of Mines, 1952), also by E. C. Seiler, Irving Hartmann, John Nagy, and England) International Conference of Directors of Mine Safety Research (7th : 1952 : Buxton (page images at HathiTrust)
• Christofel, F. P.: Ignition of coal dust by permissible explosives (U.S. Dept. of the Interior, Bureau of Mines, 1952), also by E. B. McGibbeny, John Nagy, and Irving Hartmann (page images at HathiTrust)
• Christofel, F. P.: Incombustible required on floor and on rib-roof surfaces of coal mines to prevent propagation of explosions (U.S. Dept. of the Interior, Bureau of Mines, 1954), also by Irving Hartmann, John Nagy, and Germany) International Conference of Directors of Mine Safety Research (8th : 1954 : Dortmund (page images at HathiTrust)

Find more by F. P. Christofel at your library, or elsewhere.