1. Background geochemistry of some rocks, soils, plants and vegetables in the conterminous United States;Connor;U.S. Geol. Surv. Prof. Paper, 514-F,1975
2. Biogeochemical investigations in the Tri-State District;Harbaugh;Econ. Geol.,1950
3. Colloidal primary copper ores at Cornwall Mines, southeastern Missouri;Rust;J. Geol.,1935
4. Study of the distribution of some geochemical data;Tennant;Econ. Geol.,1959
5. Geology of Ste. Genevieve County, Missouri;Weller;Missouri Bureau of Geology and Mines, Rolla, Mo.,1928