I am a historian researching Charlie Jenkins (Charles Lamont Jenkins, Sr.), an American Olympic gold medalist in 1956. Jenkins describes "working in seventeen Asian countries, representing the U.S. State Department over a three year period." He recalls "lecturing, conducting clinics for Asian Physical Education teachers and teaching coaches in track and field techniques." I estimate that Jenkins did this between the years 1957 and 1962. How might I find records relating to these programs?