Self-demarcating code words
Subtitle: a set of three and four letter code words with serially-unique and disjunctive combination forming characteristics [by] Hans Peter Luhn
Edition: 2d ed.
Publisher: International Business Machines Corporation
Published: 1956
Place of publication: New York
Language: eng
Number of pages: 84
Copyright date: 1956
Subjects: Information storage and retrieval systems; Code words; Indexing; Punched card systems