van der Tak, Heman G. The economic benefits of road transport projects / Heman G. van der Tak & Anandarup Ray - Washington : IBRD , 1971 - ix, 42p. : ill. ; 24 cm. - Distributed by Hopkins, Baltimore World Bank staff occasional papers . Includes bibliographical references and index. ISBN: 080181314X Subjects--Topical Terms: Road transportMathematical modelsTransport Dewey Class. No.: 388 / VAN