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1887
Geological Map of the New Al …
Becker, George F.
4580.005
1887
Ore-Bodies and Topography of …
Becker, George F.
4580.006
1887
Plan of the New Almaden Mine …
Becker, George F.
4580.007
1887
Longitudinal Section of the …
Becker, George F.
4580.008
1887
North and South Sections vic …
Becker, George F.
4580.009
1887
East and West Vertical Secti …
Becker, George F.
4580.010
1887
Plan of the Clay Walls, New …
Becker, George F.
4580.011