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Ralph Prins
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international courses hydraulic and sanitary engineering; international course in environmental sceince and technology 1972-1973
international courses hydraulic and sanitary engineering; international course in hydraulic engineering 1970-1971 / 1971-1972
international courses hydraulic and sanitary engineering; general prospectus
international courses hydraulic and sanitary engineering; prospectus 1973-1974
international courses in hydraulic and sanitary engineering; handbook 1975 1976 environmental science and technology
international institute for hydraulic and sanitary engineering; handbook 1976 1977, specialization programme for the directorate general of water-resources development of the republic of indonesia
international courses hydraulic and sanitary engineering;newsletter for alumni no.3 1970
international courses hydraulic and sanitary engineering; report series no. 7
International courses hydraulic and sanitary engeneering, international courses in environmental science and technology