Treaties and other international acts and series. 2009. Health and sanitation, cooperative urogram in Bolivia, agreement between United States and Bolivia, modifying and extending agreement of July 15 and 16, 1942, as modified and extended, effected by exchange of notes signed La Paz, July 28 and 29, 1949; entered into force July 29, 1949, operative retroactively from June 30, 1949.