Aeromagnetic and Tectonic Analysis of the Upper Mississippi Valley Zinc-Lead District: Geological Survey Bulletin 1242-A (1966) ~ by Allen V. Heyl, and Elizabeth R. King

Description

Aeromagnetic and Tectonic Analysis of the Upper Mississippi Valley Zinc-Lead District: Geological Survey Bulletin 1242-A

By Allen V. Heyl, and Elizabeth R. King

Published: 1966

Fair condition, thin, staple-bound, greenish-gray softcover with a fold-up map kept within a pouch on the back inside cover.  The cover has fading, creases, wrinkling, and small tears.  Some pages have creases or wrinkles.  The title page has writing in pencil and eraser marks.  Text and illustrations throughout are clean, clear, and legible.  The fold-up map is in great shape.

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