Records in S-1929 document the coordination between the Bureau of Technical Assistance Operations (BTAO) of the Department of Economic and Social Affairs (DESA) and United Nations Member States, United Nations regional economic commissions and United Nations specialized agencies. The bulk of the records dates from 1960 to 1965 and details the planning and implementation of the Development of Water Resources of the Lower Mekong Basin project in the countries of Cambodia, Laos, Thailand and Vietnam.
Records in S-1929 provide information on the collaboration between the BTAO and the Committee for Co-ordination of Investigations of the Lower Mekong Basin. The committee was first created in 1957, following a report issued by the Economic Commission for Asia and the Far East (ECAFE) that called for the close cooperation of the governments of Cambodia, Laos, Thailand and Vietnam through a permanent committee. BTAO served as a cooperating agency on the project, along with the UN Special Fund, the International Labour Organization (ILO), and the Food and Agriculture Organization (FAO), among others. The project aimed to improve flood control and develop the areas surrounding the Lower Mekong River through the construction of dams on the mainstream river and its tributaries. Records in S-1929 document: the Pa Mong, Tonle Sap, Sambor, Battambang, Nam Pong, and Upper Se San projects.
The records include correspondence and memoranda, meeting minutes, and reports. Correspondence and memoranda document preliminary surveys, project planning and implementation, and funding sources. The reports include: monthly progress reports, UN expert reports, investigative and feasibility reports issued by engineering consulting firms, and final reports of committee sessions.