Special summary report on mine acid control

"Commonwealth of Pennsylvania Department of Health. Industrial fellowship no. 326B-6."

Geology and ore deposits of the Afterthought Mine : Shasta County, California.

Mode of access: Internet.

Proceedings of the ... convention of the United mine workers of America ...

No more published?

Federal metal and nonmetallic mine safety act. Hearings before the Select Subcommittee on Labor of the Committee on Education and Labor, House of Representatives, Eighty-ninth Congress, first session, on H. R. 6961 and similar bills, a bill to promote health and safety in metal and nonmetallic mineral industries, and for other purposes.

Adam C. Powell, chairman.