I. Hartmann

Ignition of coal dust by permissible explosives

I. Hartmann, J. Nagy, E. B. McGibbeny, 1952 .

Laboratory explosibility study of American coals

M. Jacobson, I. Hartmann, R. P. Williams, 1954 .

Experiments on strength of small pillars of coal in the Pittsburgh bed

I. Hartmann, H. P. Greenwald, H. C. Howarth, 1939 .