1. Office of Naval Research, Department of the Navy, A Survey of Automatic Digital Computers, Washington, D. C., 1953, p. 53.
2. L. M. Milne-Thomson & L. J. Comrie, Standard Four-Figure Mathematical Tables, Edition B, MacMillan & Co., Ltd., London, 1931; Edition A, MacMillan & Co., Ltd., London, 1944.
3. H. M. Nautical Almanac Office, Seven-Figure Trigonometrical Tables for Every Second of Time, H. M. Stationery Office, London, 1939.
4. Edgar Karst, Tables for converting 4 digit decimal fractions to periodic octal fractions. [See Review 6, MTAC, v. 10, 1956, p. 37.]