Based on information contained in producers' catalogs, this publication lists 20 reference books produced in braille, 18 sound recordings of reference works available on cassettes, and 7 reference books produced in large type. For each entry, bibliographic information is given for the print edition, followed by pertinent information about the special edition and, when available, the number of volumes or cassettes is also indicated. It is noted that books for which "NLS" (National Library Service for the Blind and Physically Handicapped) is listed as a source may be borrowed on free loan by qualified residents of the United States and American citizens living abroad. Also provided are a list of all the sources cited with information on general purchase or loan arrangements used by these sources and a title index to the reference works included. (KM)