Ore Dressing; Volume 04
Rachel Carson and Her Sisters
Robert Hallowell
Robert Hallowell
Robert Hallowell Richards
A Text Book of Ore Dressing. By R.H. Richards ... Assisted by Earl S. Bardwell and Edwin G. Goodwin ... Third Impression, Corrected
In Memoriam Robert Hallowell Gardiner
A Text Book of Ore Dressing. By R.H. Richards ... and C.E. Locke ... Assisted by John L. Bray ... Second Edition [of the Work by R.H. Richards], Etc
Ore Dressing
His Mark
Textbook of Ore Dressing. By R. H. Richards ... and C. E. Locke ... assisted by Reinhardt Schuhmann ... Third edition, completely revised and rewritten
Ore Dressing: Accessory apparatus
Ore Dressing
Notes on Assaying
A New Prismatic Stadia
Ore Dressing
Ore Dressing
Ore-dressing Improvements
Close Sizing Before Jigging