Rachel Carson and Her Sisters
Ore Dressing; Volume 04
Robert Hallowell
Robert Hallowell Richards
Robert Hallowell
In Memoriam Robert Hallowell Gardiner
A Text Book of Ore Dressing. By R.H. Richards ... Assisted by Earl S. Bardwell and Edwin G. Goodwin ... Third Impression, Corrected
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
Ore Dressing
Notes on Assaying
A New Prismatic Stadia
Ore Dressing
Ore Dressing
Close Sizing Before Jigging