Purdue, A. H. (Albert Homer), 1861-1917Burchard, Ernest F. (Ernest Francis), 1875-1961Ulrich, Edward Oscar, 1857-1944Walcott, Charles D. (Charles Doolittle), 1850-19272015-04-092015-04-091904http://hdl.handle.net/2346/61716183 p.engGeological Survey (U.S.)ArkansasZincLeadZinc and Lead Deposits of Northern ArkansasBookUnrestricted.