Dr. Glass was granted sabbatical leave in 1957-1958, 1970-1971, and 1974-1975. His first leave was spent in England, primarily at the Imperial College of Science and Technology in London. His proposed sabbatical leave for 1966-1967 had to be postponed and he took it in 1970-1971. He arranged a global trip, which took him to the 8th International Shock Tube Symposium in London and the International Symposium on the Dynamics of Ionized Gases in Tokyo.
In 1972 he began planning for his next sabbatical. It began in England, and continued through France, the Netherlands, Belgium, and Denmark. As his book, Shock Waves and Man, had recently appeared, he was much in demand both in academic and research (both military and civilian) circles as a speaker. He then went on to Israel, Iran, India, Thailand, Hong Kong, and Japan. While in Japan as a visiting professor, he attended the 10th International Shock Tube Symposium. He returned to Toronto via Hawaii, San Francisco and Chicago, giving lectures and seminars as he went.
In addition to his sabbatical leaves, Dr. Glass travelled widely. His first major trip was to the USSR in 1961, with a side vacation to Israel. In 1963, he visited a number of universities in the mid and western United States. In 1965, he was back in Europe attending the VII Symposium on Advanced Problems and Methods in Fluid Dynamics in Poland. In 1980, he made another tour of the Far East, visiting China as a guest of the Academy of Sciences, and then going on to Japan. In 1985, he made a return visit, receiving an "honorary professoriate" from the Nanjing Aeronautical Institute.
The files contain correspondence, calendars and diaries, notes, research notes, conference programs, abstracts, drafts of lectures and addresses, and photoprints. There is extensive material on the symposia mentioned above.