Moving asbestos and mine supplies over dirt roads; remarkable showing by crawler tractors and trailers; beneficial effect on roads; influence of cheaper gasoline on problem.
The economics of African road transport
S. African Engr
South African Engineer ; 21 , n 131 ; p 7 + 9 + 11 + 13 + 14
1929
3 Figs.
Article (Journal)
English
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