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Orientation of surface and underground surveys by means of plumb lines freely suspended in vertical shafts
Tests of various methods for orientation of surface and underground surveys which could be carried out with colliery appliances.
Orientation of surface and underground surveys by means of plumb lines freely suspended in vertical shafts
Tests of various methods for orientation of surface and underground surveys which could be carried out with colliery appliances.
Orientation of surface and underground surveys by means of plumb lines freely suspended in vertical shafts
Iron Coal Trades Rev
Gilchrist, G.A. (author)
1926
Article (Journal)
English
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