1981 Archived Outside Coal Journal Articles
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Year 1981:
Berchtold - Winter 1981.djvu
Berg, Reiser - Winter 1981.djvu
Graham - Winter 1981.djvu
Heunisch - Winter 1981.djvu
Ingraham - Winter 1981.djvu
Jacobs - Winter 1981.djvu
Montogomery - Winter 1981.djvu
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