Comprises:
- D1, (a) Computing by Calculating Machines, lecture to Office Machinery Users's Assoc., 1927; (b) L.J. Comrie, On the Application of the Brunsviga-Dupla Calculating Machine to Double Summation with Finite Differences, Monthly Notices of R.A.S. (1928);
- D2, L.J. Comrie, Recent Developments in Calculating Machines, Office Machinery Users' Association Transactions (1927-28), (2 copies);
- D3, L.J. Comrie, German Calculating Machine Enterprise, The Transactions of the Office Machinery Users Association (1928-29);
- D4, L.J. Comrie, The Hollerith and Powers Tabulating Machines, Office Machinery Users' Association Transactions (1929-30).
- D5, L.J. Comrie, Professional Work in Departments of State, His Majesty's Nautical Almanac Office, State Service, n.d. [?1932]. (3 copies);
- D6, L.J. Comrie, The Nautical Almanac Office Burroughs Machine, Monthly Notices of R.A.S. (1932);
- D7, L.J. Comrie, The Application of the Hollerith Tabulating Machine to Brown's Tables of the Moon, Monthly Notices of R.A.S. (1932);
- D8, (a) L.J. Comrie, The Hollerith and Powers Tabulating Machines, printed for private circulation (1933), (2 copies); (b) L.J. Comrie, Computing the Nautical Alamanac, Nautical Magazine (1933);
- D9, L.J. Comrie, Inverse Interpolation and Scientific Applications of the National Accounting Machine (1936). (4 copies);
- D10, L.J. Comrie, Calculating Machines (1938 and various editions). (6 copies);
- D11, L.J. Comrie, Mechanical Computing (1943);
- D12, L.J. Comrie, Careers for Girls, Mathematical Gazette (1944);
- D13, L.J. Comrie, Recent Progress in Scientific Computing, Journal of Scientific Instruments, vol. 21 (1944);
- D14, L.J. Comrie, The Twin Marchant Calculating Machine and its Application to Survey Problems, Scientific Computing Service Limited (1942);
- D15, L.J. Comrie, Mathematical Tables and Selected Works on Calculating Machines and Computing, Scientific Computing Services (1945);
- D16, J.R. Womersley, Scientific Computing in Great Britain, and L.J. Comrie, The Application of Commercial Calculating Machines to Scientific Computing, Mathematical Tables and Other Aids to Computation (1946);
- D17, Scientific Computing Service Ltd. A Description of its Activities, Equipment and Staff (1946);
- D18, L.J. Comrie, Calculating Past, Present and Future, Future, Overseas No. 6169 (1947), (2 copies);
- D19, L.J. Comrie, Mechanical Computing, Plane and Geodetic Surveying, vol. 2 (1950);
- D20, L.J. Comrie, Scientific Applications of the National Accounting Machine (1951);
- D21, L.J. Comrie, Modern Babbage Machines, Office Machinery Users' Assoc., typescript, pp. 29, n.d.