Hartman, H. L. (1987). Introductory mining engineering. Wiley.
Lua i Stíl Chicago (17ú heag.)Hartman, Howard L. Introductory Mining Engineering. New York: Wiley, 1987.
Lua MLA (9ú heag.)Hartman, Howard L. Introductory Mining Engineering. Wiley, 1987.
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