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Exploration and development of small mines
Krumlauf, Harry E.
Bok Engelsk 1966
The use of compressed air sin small mines
Krumlauf, Harry E.
Bok Engelsk 1963
Proceedings of Symposium: Surface Mining Practices, October 17, 18 and 19, 1960
Symposium: Surface Mining Practices
Bok Engelsk 1960
Exploration and development of small mines
Krumlauf, Harry E.
Bok Engelsk 1954