1. Correlative indexes I. Alphabetical correlative indexes
2. Zatocoding applied to mechanical organization of knowledge
3. “A New Semantic Principle in Information Retrieval Systems”, A paper presented before the American Documentation Institute, November 5, 1954.
4. and , “Indexing and Index Searching”, p. 347, Chapter 23 in, and Punched Cards. Their Applications to Science and Industry, New York, Reinhold, 1951.
5. Indexing Abstracts