Books by Neil C. Mangum:
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Mangum, Neil C.: In the Land of Frozen Fires: A History of Occupation in El Malpais Country (illustrated HTML at National Park Service)
Additional books by Neil C. Mangum in the extended shelves:
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Mangum, Neil C.: In the land of frozen fires : a history of occupation in El Malpais country (Division of History, Southwest Cultural Resources Center, Southwest Region, National Park Service, Dept. of the Interior, 1990), also by Southwest Cultural Resources Center. Division of History (page images at HathiTrust)
Find more by Neil C. Mangum at your library, or elsewhere.