Comments on the "three-step" method for quantification of undiscovered mineral resources [unknown]

M.W. Bultman, E.R. Force, M.E. Gettings, F.S. Fisher
1993 Antarctica A Keystone in a Changing World   unpublished
doi:10.3133/ofr9323 fatcat:poln6s7rkjdnfidn2mc6rkvnje