01012cam a22002891 4500 gs 05000909 DLC 20260227111302.0 790220s1905 dcuabf b f001 0 eng gs 05000909 (OCoLC)4671699 DLC ICharE DLC premarc n-us-ak QE75 .B9 no. 263 Purington, Chester Wells, 1871- Methods and costs of gravel and placer mining in Alaska / by Chester Wells Purington. Washington, Govt. Print. Off., 1905. 273, vii p. : ill., xlii pl. (2 fold. incl. map) diagrs. ; 24 cm. U.S. Geological survey. Bulletin no. 263 Subject series: A, Economic geology, 55. "Notes on dredging, by J. P. Hutchins": p. 173-190. Bibliography: p. 261-262. Includes index. Gold mines and mining Alaska. Geological Survey (U.S.). Bulletin ; no. 263. 24318 24318