The second of a three-volume final report presents results of three studies on indexing systems for tape recordings used by blind persons. Study I is explained to have compared five tonal index codes in order to identify a code that required minimal display time, that had easily discriminable characters, and that could be easily learned. Results are seen to indicate that the code with variations in duration surpassed all others in ease of learning. Study II reports on an experiment in which 21 legally blind Ss in grades 7-12 who, after receiving two hours training in this code, learned to find indexed parts of a textbook in an average time of 2 minutes and with 92% accuracy. Described in Study III is a comparison of three vocal index systems used by 24 legally blind Ss in grades 7-12. The three systems are said to include recording index information on the same track as text content, use of four-track systems to provide index information, and use of the Zimdex (number) system. Accuracy of use and location times for all three systems are reported to have met standards for practical use. Among general conclusions of the studies cited is that the system with vocal information recorded on the same track as the content appears superior. (Author/CL)