Technico-economic, organizational, and administrative aspects of inland waterborne transport : report of the united nations interregional symposium / United Nations. United Nations Interregional Symposium on Technico-economic, Organizational and Administrative Aspects of Inland Waterborne Transport, Leningrad, 1968. United Nations. Office of Technical Co-operation. Inland water transportation Congresses. 386.2243 UNT New York, United Nations, 1970. 1970. 1970 Text iii, 73 p. ; eng