IRS13 Search Matching Functions chapter E. M. Keen Harvard University Gerard Salton Use, reproduction, or publication, in whole or in part, is permitted for any purpose of the United States Government. 111-3 Request Documents on cerebrospinal fluid oxygen concentrations. a) Dictionary Catalogue using Library of Congress Subject Headings: CEREBROSPINAL FLUID OXYGEN IN THE BODY ANOXEMIA etc. b) Classified Catalogue using Library of Congress Classifications: RC [OCRerr]oo-1+o6 Diseases of the spinal cord RB55 Spinal fluid (Examination) RClO4.A4 Deficiency of oxygen in the blood; anoxemia; etc. c) K[OCRerr][OCRerr]IC Index based on natural language document titles: CEREBROSPINAL OXYGEN OXYGENATION FLUID etc. [OCRerr]othetical request showing some of the search terms that could be considered for use in t[OCRerr]ree types of manually searched indexes. Figure 1.