A National Park Service publication, "Access National Parks: A Guide for Handicapped Visitors," has been selected by the Library of Congress as the subject of its first voice-indexed cassette presentation.

The nation's first fully voice-indexed talking book cassette, which describes accessible services, facilities and progrms in all parks and monuments in the National Park System, was presented in a recent ceremony to Assistant Secretary Robert L. Herbst, representing Secretary of the Interior Cecil D. Andrus, and to National Park Service Director William J. Whalen.

Voice indexing uses words, in this case the names of the individual parks, to help readers locate specific information. Index words are audible when the cassette is played in a fast-forward mode. The reader then stops the tape and resumes play at regular speed to hear the full entry under that heading. The method of voice-indexing has been known for some time, but until now has been impractical for production.

When it was published last year, the guidebook was selected by the Library of Congress for production of both braille and talking-book editions by the Library's National Library Services for the Blind and Physically Handicapped.

The "Access" tape is the prototype for voice-indexed cassettes and will be used to test reader reaction. Additional indexed books and a proposed 20,000-word dictionary will also be produced, incorporating reader suggestions. 2