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Accidents from hand and mechanical loading in some Illinois coal mines

by Alfred C. Callen and Cloyde M. Smith
Bok Engelsk 1931

Washability tests of Illinois coals : by Alfred C. Callen and David R. Mitchell

Callen, Alfred C.
Bok Engelsk 1930

The measurement of air quantities and energy losses in mine entries. Pt. 4. Investigation in timbered entries

by Cloyde M. Smith
Bok Engelsk 1929

The measurement of air quantities and energy losses in mine entries. Pt. 3.

Callen, Alfred C.
Bok Engelsk 1928

The measurement of air quantities and energy losses in mine entries. Pt. 2.

Callen, Alfred C.
Bok Engelsk 1927

The measurement of air quantities and energy losses in mine entries [Pt. 1]

Alfred C. Callen and Cloyde M. Smith
Bok Engelsk 1926

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