The collection contains records relating to Father Asselin’s religious life, including certificates of baptism and confirmation, memorial cards, and a letter confirming his ordination (in Latin), as well as personal documents like passports, memos, and military certificates.

Many records in the collection testify to Father Asselin’s religious/academic involvement, including a copy of the Spiritual Exercises and his own research and publications on the Exercises, a booklet published by Father Asselin about spirituality, newspaper articles featuring his research, photographs from his lectures, scholastic certificates, and Loyola College mementos and brochures. Abundant correspondence from the 1950s to 1970s—mostly scholastic in nature and having to do with the Spiritual Exercises (which was his speciality), but extending to casual correspondence with friends, colleagues, and family—can also be found in the collection.

A number of photographs and negatives may be found in the collection which depict Father Asselin at a military camp and various religious ceremonies and conferences.