Available to registered users of the original 2-volume set, and also bundled with new copies of this publication, this Update combines a booklet and CD-ROM boasting more than 100 additional isotopes as well as updated appendices that include elemental data, nuclear charts, and gamma-ray energy standards data. Improved Isotope Explorer version 2.2 is provided on the CD-ROM along with an updated manual and the latest versions of the Evaluated Nuclear Structure Data File (ENSDF) and Nuclear Science Reference (NSR) file for Isotope Explorer.