OS UPDATE RELEASE 20. Pt. 1, reel 1-2--pt. 2, reel 1-2. International Business Machines Corp. 4 motion pictures (45 min. each), sd., b&w. Videotape (1 in.) © International Business Machines Corp.; 14Jul71; MP21930, 21934-21935, 21932.

OS UPDATE RELEASE 20.1. Pt. 1, reel 1. International Business Machines Corp. 53 min., sd., b&w. Videotape (1 in.) © International Business Machines Corp.; 13Jul71; MP21931.

OS UPDATE RELEASE 20.1. Pt. 2, reel 3. International Business Machines Corp. 58 min., sd., b&w. Videotape (1 in.) © International Business Machines Corp.; 13Jul71; MP21933.

OBSERVATION OF URINE AND FECES. Comprenetics. 18 min., sd., color, Super 8 mm. Loop film. © Comprenetics, Inc.; 14May71 (in notice: 1970); MP21958.

OBSERVING AND DESCRIBING. McGraw-Hill Films & Hanna-Barbera Productions. 11 min., sd., color, 16 mm. Appl. author: McGraw-Hill Book Co. © McGraw-Hill, Inc. & Hanna-Barbera Productions, Inc.; 20Dec69; MP21682.

OCCUPIED BED MAKING. Blakiston Division, McGraw-Hill Book Co. 9 min., sd., color, 16 mm. (Fundamental nursing series, study unit 8: Personal procedures care) Produced in collaboration with William Claiborne, Inc.

Credits: Producer, William Claiborne; director, Nettie M. Hutchins.

Cast: Joyce Foldy, Dorothy Groner.

© McGraw-Hill, Inc.; 26Oct70; MP21729.

THE OCEAN AND THE WORLD ECOSYSTEM. See