This series is made up of three major sections: correspondence, materials related to TCW's career, and TCW's death. Correspondence in the series includes personal correspondence, mostly from other Wasson family members, and professional correspondence about his diplomatic work. Personal correspondence was recieved from Edmund Atwill Wasson (his father), Matilda DeVeny Wasson (his mother), Robert Gordon Wasson (his brother), Phyllis Crompton, and Josephine Blair.

Career papers include TCW's writing, official government reports and publications, and photographs. Career papers related to TCW's time posted in Dakar is especially well represented. Records related to TCW's death include government repoports, news clippings, conolence letters sent to the family, and memorial event plans.

There is also a small amount of personal papers in the series, including his diaries and photographs.