Green and Kiefer proffer advice on investing in trading cards. Successful investing is significantly different from collecting. A collector acquires items that are personally pleasing or significant, giving little or no thought to their resale value. Reselling for profit is the heart of investing. In 101 short chapters, Green and Kiefer cover such issues as knowing when to buy and sell an individual player's cards and identifying cards that are undervalued. Typical of their tips: sell rookie cards after a few years because so many players who have good first years do not go on to stellar careers; invest in hockey cards because they are generally undervalued; and be leery of recent cards--they are unlikely to become rare, because card manufacturers have printed many more copies of cards since the 1980s. Although highly recommended for currency and depth, Green and Kiefer's effort is not for the novice collector because it doesn't discuss card grading and other basic skills. 236 pages