suitability of supports used underground on the Witwatersand.
By: By J. W. Bowen, M.Sc. (Timber research laboratory, Transvall chamber of mines) ...
Contributors: Transvall chamber of mines, Johannesburg. Timber research laboratory.
Published: 1941
Place of publication: Johannesburg
Language: eng
Number of pages: 24
Subjects: Mine timbering -- South Africa -- Witwatersrand; Witwatersrand (South Africa)
Notes: "Reprinted from the Journal of the South African institution of engineers, February, 1941."

"Erratum" slip tipped in.

Cover-title.