A platform for research: civil engineering, architecture and urbanism
A platform for research: civil engineering, architecture and urbanism
An account of placers which have been worked by primitive and modern methods for many years. (4500 w.) (No. 28700)
An account of placers which have been worked by primitive and modern methods for many years. (4500 w.) (No. 28700)
Placer mining in Colombia
Eng Min Jour
Johnson, R.D.O. (author)
1911
Map
Article (Journal)
English
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