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The geology of the upper Mississippi Valley Zinc-lead district / by Allen V. Heyl...[et al.].

by Heyl, Allen Van, 1918-2008.

Material type: book Book Publisher: Washington : United States Government Printing Office, 1959Availability: Items available for loan: Biblioteca Aranzadi [Call number: 55(762) GEO] (1).
Mercury and other trace elements in sphalerite and Wallrocks from Central Kentucky, Tennessee and Appalachian Zinc districts / by Janice L. Jolly and Allen V. Heyl.

by Jolly, Janice L | Heyl, Allen Van, 1918-2008.

Material type: book Book Publisher: Washington : United States Government Printing Office, 1968Availability: Items available for loan: Biblioteca Aranzadi [Call number: 550.4 JOL] (1).
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