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1887
Geological Map of the Sulphu …
Becker, George F.
4580.002
1887
Geological Map of the New Id …
Becker, George F.
4580.004
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