01012cam a22002891  4500001001300000003000400013005001700017008004100034010001700075035001900092040002100111042001200132043001200144050002200156100003700178245009100215260004300306300007200349490004600421500004500467500005600512504003000568500002000598650003500618810005200653999001700705gs 05000909 DLC20260227111302.0790220s1905    dcuabf   b   f001 0 eng    ags 05000909   a(OCoLC)4671699  aDLCcICharEdDLC  apremarc  an-us-ak00aQE75b.B9 no. 2631 aPurington, Chester Wells,d1871-10aMethods and costs of gravel and placer mining in Alaska /cby Chester Wells Purington.  aWashington,bGovt. Print. Off.,c1905.  a273, vii p. :bill., xlii pl. (2 fold. incl. map) diagrs. ;c24 cm.1 aU.S. Geological survey. Bulletinvno. 263  aSubject series: A, Economic geology, 55.  a"Notes on dredging, by J. P. Hutchins": p. 173-190.  aBibliography: p. 261-262.  aIncludes index. 0aGold mines and miningzAlaska.2 aGeological Survey (U.S.).tBulletin ;vno. 263.  c24318d24318