1. Aeromagnetic and tectonic analysis of the Upper Mississippi Valley zinc-lead district : a magnetic study indicating major geologic structures in the basement rock which controlled in part the locations of overlying ore deposits Author/Creator: Heyl, Allen V. 1918-2008, (Allen Van), author Publication/Creation: [Washington, D.C.] : United States Department of the Interior, Geological Survey, 1966 Format: Book Access & Availability: Loading
2. Regional structure of the southeast Missouri and Illinois-Kentucky mineral districts : study of the principal geologic structures and mines in and between two major mineral-producing districts Author/Creator: Heyl, Allen V. 1918-2008, (Allen Van), author Publication/Creation: [Washington, D.C.] : United States Department of the Interior, Geological Survey, 1965 Format: Book Access & Availability: Loading
3. Oxidized zinc deposits of the United States. Part 2, Utah Author/Creator: Heyl, Allen V. 1918-2008, (Allen Van), author Publication/Creation: Washington, D.C. : United States Department of the Interior, Geological Survey, 1963 Format: Book Access & Availability: Loading
4. Oxidized zinc deposits of the United States. Part 1, General geology Author/Creator: Heyl, Allen V. 1918-2008, (Allen Van), author Publication/Creation: Washington, D.C. : United States Department of the Interior, Geological Survey, 1962 Format: Book Access & Availability: Loading
5. The geology of the upper Mississippi Valley zinc-lead district Author/Creator: Heyl, Allen V. 1918-2008, (Allen Van), author Publication/Creation: Washington : United States Department of the Interior, Geological Survey, 1959 Format: Book Access & Availability: Loading
6. Zoning of the Bitter Creek vanadium-uranium deposit near Uravan, Colorado Author/Creator: Heyl, Allen V. 1918-2008, (Allen Van), author Publication/Creation: [Washington, D.C.] : [United States Department of the Interior, Geological Survey], [1957] Format: Book Access & Availability: Loading
7. Zinc-lead-copper resources and general geology of the upper Mississippi Valley district Author/Creator: Heyl, Allen V. 1918-2008, (Allen Van), author Publication/Creation: [Washington, D.C.] : United States Department of the Interior, Geological Survey, 1955 Format: Book Access & Availability: Loading
8. Exploratory drilling in the Prairie du Chien group of the Wisconsin zinc-lead district by the U.S. Geological Survey in 1949-1950 Author/Creator: Heyl, Allen V. 1918-2008, (Allen Van), author Publication/Creation: Washington, D.C. : United States Department of the Interior, Geological Survey, 1951 Format: Book Access & Availability: Loading