Beaven, P. J.
The performance of experimental weathered basalt gravel roads in Ethiopia / by P.J. Beaven, R. Robinson & Kassaye Aklilu. - Crowthorne, Berkshire : Overseas Unit, Transport and Road Research Laboratory, 1988. - 26 p. : ill. - TRRL research report, 147 0266-5247 ; . - Transport and Road Research Laboratory research report .
90033026
Roads, Gravel.
Roads--Design and construction--Ethiopia.
The performance of experimental weathered basalt gravel roads in Ethiopia / by P.J. Beaven, R. Robinson & Kassaye Aklilu. - Crowthorne, Berkshire : Overseas Unit, Transport and Road Research Laboratory, 1988. - 26 p. : ill. - TRRL research report, 147 0266-5247 ; . - Transport and Road Research Laboratory research report .
90033026
Roads, Gravel.
Roads--Design and construction--Ethiopia.