THE ENCYCLOPEDIA OF MEDICINAL PLANTS by Andrew Chevallier is a relatively comprehensive source of information about herbal uses for healing. This is not the most recent volume by this author, however. The 2000 version is more comprehensive and includes the most current information about research associated with herbal medicinal uses.
A less expensive and highly useful book on herbs and their uses is available from Rodale, entitled, ILLUSTRATED ENCYCLOPEDIA OF HERBS. The Rodale book includes information missing from this version of Chevallier's book concerning negative effectives of herbs including accidental poisoning owing to misuse or problems with plant identification. Also, Rodale has been the the organic growing business for several decades and offers information about plant horticulture. Chevallier's book is better illustrated, and filled with many colorful photographs but relatively less text (ratio of 1:4 pages for each item).
Unlike Ody's book, THE COMPLETE MEDICAL HERBAL, the Chevallier book contains information about native American herbs such as Cimicifuga Racemosa (Squawroot, Black Cohash). THE COMPLETE BOOK OF HERBS by Leslie Bremmness does not contain the comprehensive coverage of medicinal uses, but it does provide much information about medicinal and other uses such as pot pourri and sachet making, paper making, and food preparation.