Vanadium Efflorescence and Its Control by the Use of Fluorspar (Classic Reprint) - Hardcover

Inhaltsangabe

Excerpt from Vanadium Efflorescence and Its Control by the Use of Fluorspar

Clay S from an underground mine was of Pennsylvanian age and is de scribed as an underclay associated with no. 2 coal in north central Illi nois.

Clay L, also of Pennsylvanian age, sometimes referred to as the Trade water clay, comes from a large open pit also in north central Illinois.

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