Author: United States. Department of Interior, Bureau of Mines [ Hooker, A.B. ; Ilsley, L.C. ; & Roadstrum, W.H.]
Title: Investigations of Permissible Electric Mine Lamps 1930-40
Description: Washington, D.C. Government Printing Office, 1942. orig.wrappers. 23x15cm, 50 pp. Series: United States. Department of Interior, Bureau of Mines, Bulletin 441.. Textual photo illustrations.. Rubberstamps to covers. VG.

Keywords: Electric Mine Lamps, Mining, United States, , , , , ,