Preliminary engineering studies for application of R-N process to Lake Superior region iron ores: sec. 1, Sampling iron ores for R-N process tests; [by L. F. Heising and R. C. Briggs], (Department of Interior, Bureau of Mines); sec. 2, Preliminary R-N commercial facility projection and technical report [with bibliography], (R-N Corporation, New York, N.Y.).

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