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A Golden work.' Hydroulic [sic] mining at Rockdrville [i.e. Rockerville], Dakota 1889.
UMG21A20_333

A Golden work.' Hydroulic [sic] mining at Rockdrvi...

The 1,200 ton hydraulic press at the shanghai heavy plant in china in the early 1960's, it is pictured processing a 55 ton machine part of steel rolling equipment, made and designed in china, the pres...
UMG20B01_382

The 1,200 ton hydraulic press at the shanghai heav...

Hydraulic gold mining - near Dutch Flat, California, C.P.R.R. 1868
UMG20A67_184

Hydraulic gold mining - near Dutch Flat, Californi...

Golden work. Hydraulic mining. 1890
UMG20A72_046

Golden work. Hydraulic mining. 1890