Print: (7th Edition) Chemistry Library Reference Stacks TP156.P83 A76 2013
Online: (4th, 5th, and 6th Editions) through Knovel Engineering and Scientific Online Reference Books
Alphabetical by compound name
The print version is the 7rd edition. The online versions are the 4th through the 6th. Since new editions are expanded to include additional reagents, the ones available online include fewer substances than the 7th edition in print, but, for most common reagents, the entries are identical across editions. The entries tend to be very short and to the point, dealing with purification methods for organic chemicals.