The 28 items in this collection, the Edwin T. Greninger Travel Letters, 1963-1992, are Christmas letters detailing the trips of Greninger. From 1969 and onward, he has entitled his years with his second wife Gem Kate as Gemini I, II, III, etc. They are thorough accounts about various journeys of North and South America, Europe, Asia, Oceania, and Africa. Most of the letters feature the United States, especially Washington, D.C., the Eastern and Southern U. S., and the Midwest. There are also many accounts of European and Caribbean vacations.

This collection is missing the Christmas travel letters from 1987 and 1988, entitled Gemini XIX and Gemini XX.