Search U.S. government technical reports digitized or harvested by TRAIL.
Mining methods and costs at the Interstate zinc & lead Co.'s Hartley Mine, Tri-state zinc and lead district
Summarized statistics of production of lead and zinc in the Tri-state (Missouri-Kansas-Oklahoma) mining district
Investigation of concentration sections at the Central mill of the Eagle-Picher Mining & Smelting Co., Cardin, Okla.