Pennsylvania State College. Dept. of Mining Engineering. (1894). The Mining bulletin. Dept. of Mining Engineering, Pennsylvania State College.
Lua i Stíl Chicago (17ú heag.)Pennsylvania State College. Dept. of Mining Engineering. The Mining Bulletin. [State College]: Dept. of Mining Engineering, Pennsylvania State College, 1894.
Lua MLA (8ú heag.)Pennsylvania State College. Dept. of Mining Engineering. The Mining Bulletin. Dept. of Mining Engineering, Pennsylvania State College, 1894.
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