11. World list of future international meetings; prepared by International Organizations Section: pt. 1, Science, technology, agriculture, medicine. Bookmark SuDoc number: LC 2.9:(date)
12. World list of future international meetings; prepared by International Organizations Section: pt. 1, Science, technology, agriculture, medicine. Bookmark SuDoc number: LC 2.9:(date)
13. World list of future international meetings; prepared by International Organizations Section:pt. 1, Science, technology, agriculture, medicine. Bookmark SuDoc number: LC 2.9:(date)