A.V. Heyl

K-Ar and Rb-Sr ages of some alkalic intrusive rocks from central and eastern United States

Robert E. Zartman, M.R. Brock, A.V. Heyl et al. · American Journal of Science · 1967 · 138 citations · Full text

Engineering, Southern Africa, Tectonic Evolution +18

Isotopic study of galenas from the upper Mississippi Valley, the Illinois-Kentucky, and some Appalachian Valley mineral districts

A.V. Heyl, Maryse H. Delevaux, Robert E. Zartman et al. · Economic Geology · 1966 · 77 citations

Geochemical Anomaly, Isotopic Study, Volcanology +13

Geology and resources of fluorine in the United States

Ralph Erskine Van Alstine, Ronald G. Worl, A.V. Heyl et al. · USGS professional paper · 1976 · 22 citations · Full text

Stratigraphy of Middle Ordovician rocks in the zinc-lead district of Wisconsin, Illinois, and Iowa

Allen F. Agnew, A.V. Heyl, Charles H. Behre et al. · USGS professional paper · 1956 · 17 citations

Sedimentary Record, Engineering, Middle Ordovician +10