00554cas a2200169 a 450000500170000000800410001703500150005805000190007310000210009224500560011326000370016930000100020649000440021665000190026065000340027981000710031320260817162445.0090228s1961    enkuu|m rtt   0|  a1eng d  a.b1152408x 4aTE7bH33 no.501 aDawson, R. F. F.13aAn analysis of the cost of road improvement schemes  aLondon :bH.M. Stat. Off.,c1961  a23 p.1 aRoad research technical paper ;vno. 50 0aRoadsxFinance 0aRoadsxMaintenance and repair2 aRoad Research Laboratory.tRoad research technical paper ;vno. 50