Heyl A. V. and King E. R. 1966 AEROMAGNETIC AND TECTONIC ANALYSIS OF THE UPPER MISSISSIPPI VALLEY ZINC-LEAD DISTRICT U. S. Geological Survey Bulletin #1242-A 8vo, in wraqps, ex-lib else some external wear, contents good with 16 pp., 1 plate, 2 figures and on this former metal mining region that covers parts of Wisconsin, Illinois, and Iowa. Hard to find. Buyer/highest bidder pays shipping, payments via Ebay preferred. Items shipped within 5 business days from receipt and clearance of payment, tracking will be posted. For more geology paleontology gold silver and other ore mining mineralogy and related geoscience and natural history books bulletins atlases and maps, please browse my other auctions.

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