Freeman Robert R Final report of the research project for the evaluation of the UDC as the indexing language for a mechanized reference retrieval system Freeman Robert R; Atherton Pauline - N York American Institute of Physics 1968 - 14p. Appendix cm. Standard No.: 7,114 Source: Textual Subjects--Topical Terms: LIBRARY SCIENCE Dewey Class. No.: 2:51M96:v, K8