Gems and jewelry (World of knowledge)

Thoroughly researched, carefully written in plain language, and replete with hundreds of specially created full-color illustrations, these durable books are equally adaptable for general reading or just plain browsing, as guidebooks, or as source material for student papers. he areas of interest covered by this unique reference library are many and varied. A concentrated wealth of information at the fingertips, available here, can make learning in the home by every member of the family a pleasurable and exciting experience!