Collection consists of correspondence written by Albert F. McGuinn, SJ primarily to Donald I. MacLean, SJ. Many of the letters were written when MacLean was a Jesuit scholastic. They concern matters related to chemistry and MacLean's vocation. The collection also includes a letter from McGuinn to MacLean's parents, two letters from McGuinn to Anthony J. Eiardi, SJ, a Boston College mathematics professor, and letters written following McGuinn's death concerning his relationship with Donald I. MacLean, SJ.

Correspondence about Albert F. McGuinn, SJ sent following his death. Second correspondent "Francis" believed to be Francis C. Mackin, SJ based on the dates and content of the letters.