00638nam a2200169   450000500170000000800410001703500150005805000230007310000210009624500790011726000740019630000100027049000370028065000470031770000330036481000710039720260818155247.0               us                  eng    a.b1155958500aTN295bU4 no. 84221 aColby, Donald S.10aMineral resource valuation for public policy /cby ... and David B. Brooks  aWashington :bU.S. Bureau of Mines, Department of the Interior,c1969  a34 p.1 aInformation circular ;vno. 842210aMines and mineral resourcesxUnited States10aBrooks, David B.,cjt. auth.1 aUnited States.bBureau of Mines.tInformation circular ;vno. 8422