The work described in this paper was performed while the author was in the employ of Carrier Corporation, Syracuse, New York.
1. C.E.SHANNON, A Mathematical Theory of Communication, Bell System Technical Journal, July 1948, and following.
2. C.N.MOOERS, Zatocoding and Development in Information Retrieval, ASLIB Proc., February 1956, p. 3 (Many other papers by this author may be obtained from his Zator Co., 79 Milk Street, Boston, Massachusetts.)
3. C.S.WISE, A Punched-Card File Based on Word Coding, pp. 93–114, in Perry and Casey’s Punched Cards, Reinhold Publishing Corporation, New York, 1951.
4. MOOERS and WISE had discussions in American Documentation, April 1950, October 1950, and October 1952.
5. H.OHLMAN, The Low-Cost Production of Marginal-Punched Cards on Accounting Machines, pp. 123–26 American Documentation, April 1957.
6. JOINT COMMITTEE OF ASM AND SLA, ASM-SLA Metallurgical Literature Classification, American Society for Metals, 1950. (Figure 5, which was based on an analysis of 4870 names by A.H.Geisler in ASM Review of Metallurgical Literature.)
7. K.A.KRIEGER, A Punched-Card System for Chemical Literature, J. of Chemical Education, March 1949, p. 163.
8. E.T.KLEMMER, Tables for Computing Informational Measures, p. 75 in Quastler’s Information Theory in Psychology, Free Press, Glencoe, Ill., 1955.
9. F.PRATT, Secret and Urgent, The Story of Codes and Ciphers, Blue Ribbon Books, Garden City, N.Y., 1942, pp. 264–78.
10. H.P.LUHN, Superimposed Coding With the Aid of Randomizing Squares for Use in Mechanical Information Searching Systems, IBM Product Development Lab., Poughkeepsie, New York, 1956.
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Subject-Word Letter Frequencies with Applications to Superimposed Coding ."
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