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Molybden ores
Rastall, R. H., (1922)
Molybdenum Ores : Rastall, R[obert] H[eron]
Rastall, Robert Heron, (1922)
Lead ores
Hall, T.C.F., (1921)
The concise Oxford dictionary of current English
Allen, Robert E., (1990)
Readings and cases in labor relations and collective bargaining
Martin, James E., (1985)
Contemporary Labor Relations/ Robert Edward Allen; Thimothy J. Keaveny
Allen, Robert Edward, (1983)