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
|