In the about 200 volumes of the 6th Edition and the New Series of the Landolt-B rnstein Handbook a lot of valuable physical and chemical information is collected by experts. The Landolt-B rnstein Substance Index 1993 was designed to help the user to find out in an easy way whether data for specific substances and physical properties of interest are present and secondly, in which volumes he has to look. Each subvolume of the Substance Index is accompanied by a floppy disk for MS-DOS and compatibles allowing annual upgrades (compressed Word 5.0 textfiles for MS-DOS and compatibles). Together with the Landolt-B rnstein Directory Disk 1.0- a Comprehensive Index as a PC-Database which allows search for physical properties - much easier access to the handbook collection than before has been achieved.