UN General Assembly
1972

"3. With respect to the exchange of hydrological and meteorological data: "(a) Those already provided will be the subject of dissemination and systematic publication through documents and pamphlets; "(b) Data to be processed, either simple observations and readings or graphic registers of instruments, will be conveyed or submitted in accordance with the judgment of the parties concerned. "4. States shall in so far as possible attempt to exchange gradually the cartographic or hydrographic results of their studies in the Plata basin in order to facilitate the defining of the dynamic system of the basin. "5. States will try as far as possible to maintain in the best possible navigation conditions the courses of the rivers under their sovereignty, adopting to this end the necessary means in order that the works will be carried out so as not to be prejudicial to any other current users of the river system.