Gregory, Cedric Errol.
Rudiments of mining practice / by Cedric E. Gregory. - 1st ed. - Clausthal-Zellerfeld, Federal Republic of Germany : Trans Tech Publications, 1983. - 141 p. : ill. ; 24 cm.
0872017834
Mining engineering.
622
Rudiments of mining practice / by Cedric E. Gregory. - 1st ed. - Clausthal-Zellerfeld, Federal Republic of Germany : Trans Tech Publications, 1983. - 141 p. : ill. ; 24 cm.
0872017834
Mining engineering.
622