Landolt-B]rnstein Directory Disc 1.0 is the comprehensive Index 1992 on discette. In an easy way the user gets an overview of the Landolt-B]rnstein volumes and its contents. The user choices a keyword of an alphabetical listand receives the volume and page number where he can find the data in the collection of numerical data and functional relationship in science and technology. Further he can find a list of all indeces, which are available in the data collection of Landolt-B]rnstein. The easy use of this discette makes it to a valuable help to find data in the handbook Landolt-B]rnstein.