The collection consists of 4 complete manuscripts and 2 partial manuscripts of “Memoirs of a Cape Breton Doctor”/ “Hang the Lantern on the Gate” (which was the original title), personal correspondence and letters of congratulations, reviews of “Memoirs of a Cape Breton Doctor” as well as a rough draft of an opening scene for a play based on “Memoirs of a Cape Breton Doctor”. This collection consists of photographs, an audio cassette tape (The Bush & The Salon), a CD (C.L. MacMillan- Oral Histories), clipping with information about the “C. Monty MacMillan” ferry, clippings of Dr. MacMillan’s obituary as well as condolence letters sent to the family, tributes that were given after the doctor's death, political speeches given by Dr. MacMillan as well as other speeches he has given and 2 scrapbooks containing clippings dealing with his time as MLA and letters of congratulations on receiving the Order of Canada.
Series consists of personal correspondence, letters of congratulations, speeches that Dr. MacMillan has given on the grand opening of a hospital, at banquets, about the annual festival held in Baddeck, welcome speeches, introductory speeches, on the opening of new schools, giving thanks for an invitation, speech to open a meeting and a speech at the launch of a new memorial park in Baddeck. Series also consists of a column called MacMillan’s Memories, a history of Baddeck Group Alcoholics Anonymous which he is mentioned in, a story about the history of Isaac’s Harbor, a loan statement and 29 photographs including weddings photos, family photos, photos of Dr. MacMillan by himself and with others, photos of a house, the C. Monty MacMillan ferry, and Dr. MacMillan in a horse drawn sleigh.