A study of general categories applicable to classification and coding in documentation / Eric de Grolier Grolier, Eric de. Classification. Subject headings. Information storage and retrieval systems. Programming languages (Electronic computers) Z696 .G84 010 GRS Translation from the French text, by the National Science Foundation. Revised by Anthony Thompson. Bibliographical references included in "Notes" (p. 161-248) Paris : Unesco, 1962. 1962. 1962 Text 248 p.; eng eng fre