Marshall Blanchard Dean was an early physician in Fort William; his son Marshall Macdougall Dean had a career with the Canadian Coast Guard and a lifelong interest in history and genealogy. Collection includes correspondence, photographs, and research materials.

The records related to cancer diagnosis and care in Northwestern Ontario, and across Ontario more broadly. Information found in this collection covers a wide variety of material which include, but are not limited to: cancer care prevention, early diagnosis and care, clinical trial notes and lectures, information on screening for cancer and breast cancer. Information regarding the Thunder Bay Regional Hospital (Ethics Committees, Pilot Projects) and the Lakehead University Centre for Health Care can be found within this collection on Cancer Care.

This fonds contains physicians' notebooks and ledgers with unknown dates and creators. A book with the title "pathology" no dates; A book titled "Medical jurisprudence and sanitary science" no date; A Day Book with the date range January 1959-June 10 1970; a Day Book dated February 01, 1909 - April 11, 1914; a Day Book dated June 1 1898-September 25 1901; a Ledger Book, with dates of 1896 & 1897; a Day Book with the dates January 8 1882- October 6 1882.