00377nam a22001097a 4500082002500000100001600025245008700041260006700128300002700195526003700222650000800259  a388.11091724bJONcD  aJones, T E   aA study of the cost-effectiveness of grading unpaved roads in developing countries  aWashington, :c1986.bTransport and road research laboratory,;  a11 p. :bill. :c28cm.  a0b0c0d388_110917240000000_JON  aMCE