Fifth International Conference of Directors of Mine Safety Research : Proceedings
Autor Greenwald, H. P. Vydáno: 1950
Kniha
Experiments on strenghts of small pillars of coal in the Pittsburgh bed
Autor Greenwald, H. P. Vydáno: 1939
Kniha
Characteristics of fuel pitches and their explosibility in pulverized form
Autor Hartmann, Irving Vydáno: 1940
Kniha