1. Aeromagnetic and tectonic analysis of the Upper Mississippi Valley zinc-lead district Author/Creator: Heyl, Allen V. 1918-2008. (Allen Van) Publication/Creation: Washington : U.S. Govt. Print. Off, 1966 Format: Book Is Part Of: U.S. Geological Survey bulletin, no.1242. Access & Availability: Loading
2. Oxidized zinc deposits of the United States. Part 3, Colorado Author/Creator: Heyl, Allen V. 1918-2008. (Allen Van) Publication/Creation: Washington, D.C. : U.S. G.P.O., 1964 Format: Book Is Part Of: U.S. Geological Survey bulletin, no. 1135. Access & Availability: Loading
3. Oxidized zinc deposits of the United States. Part 2, Utah Author/Creator: Heyl, Allen V. 1918-2008. (Allen Van) Publication/Creation: [Washington, D.C.] : U.S. G.P.O., 1963 Format: Book Is Part Of: U.S. Geological Survey bulletin, no. 1135. Access & Availability: Loading
4. Oxidized zinc deposits of the United States. Part 1, General geology Author/Creator: Heyl, Allen V. 1918-2008. (Allen Van) Publication/Creation: [Washington, D.C.] : U.S. G.P.O., 1962 Format: Book Is Part Of: U.S. Geological Survey bulletin, no. 1135. Access & Availability: Loading
5. The geology of the upper Mississippi Valley zinc-lead district, Author/Creator: Heyl, Allen V. 1918-2008. (Allen Van) Publication/Creation: Washington : U.S. Govt. Print. Off, 1959 Format: Book Is Part Of: U.S. Geological Survey professional paper, no. 307-309. Access & Availability: Loading