The collections is composed of autobiographical, biographical, memoir, and obituary material relating to Professor A. C. Aitken; war souvenirs and maps; correspondence relating to Aitken's publication From Gallipoli to the Somme; review material relating to From Gallipoli to the Somme; circa 20 photographs, both portrait and group; 3 commonplace (scrap-)books containing cuttings and newspaper articles on a variety of subjects - some relating to New Zealand; circa 60 musical scores, and letters and printed matter that had been contained within the musical material; photographs of an area near Nelson, New Zealand; material relating to Aitken from Professor N. Kemmer; papers and correspondence relating to his work at Edinburgh University; letters and copies of letters from Aitken to Dr. Robert Schlapp, 1933-1970; letters to Robin Schlapp transcribed from diaries, 1923-1958; and letters to and from family and friends.
There is a folder of material with legal documents and personal material: relating to Aitken's estate; commission by the curators of Edinburgh University in favour of Professor Aitken; birth certificate of his wife, 11 May 1894; letters of testimonial, 1923; letter from Royal Society of Literature; and, material relating to illness in 1926.
The collection also contains some off-prints and publications by Aitken: The case against decimalisation(1962), and The art of mental calculations; with demonstrations(1954); Hunter, Ian M. L. An exceptional memory (1977); and, Hunter, Ian M. L. An exceptional talent for calculative thinking (1962).