This June 19, 1972 newsletter written by Henry Lansford describes the research aircraft used for cloud seedings, as well as the two seeding days and one research day that took place since the previous newsletter. Three foreign scientists who were visiting the National Hail Research Experiment pro... Show moreThis June 19, 1972 newsletter written by Henry Lansford describes the research aircraft used for cloud seedings, as well as the two seeding days and one research day that took place since the previous newsletter. Three foreign scientists who were visiting the National Hail Research Experiment project are mentioned. Show less