DR. RUTH'S SEX AFTER 50, by Ruth K. Westheimer, with Pierre A. Lehu Sanger. CA: Quill Driver Books/Word Dancer Press, Inc., 2005, 242 pages, softcover, $4.95. Reviewed by Barbara Kennedy, Ronald A. Schmidt. ENCYCLOPEDIA OF AGEISM, edited by Erdman B.Palmore, Laurence Branch and Diana K. Harris. Binghamton, NY: The Haworth Press, 2005, 347 pages, softcover, $9.95. Reviewed by Leo Uzych. GERONTOLOGICAL PRACTICE FOR THE TWENTY-FIRST CEN-TURY: A SOCIAL WORK PERSPECTIVE, by Virginia E. Richardson and Amanda S. Barusch. New York, NY: Columbia University Press, 2006, 512 pages, hardcover, $5.00. Reviewed by Robin J. Jacobs. THE MATURE MIND: THE POSITIVE POWER OF THE AGING BRAIN, by Gene D. Cohen. NY: Perseus Books, 2005, 224 pages, softcover, $5.95. Reviewed by Cheryl Osborne. SEASONS OF LOSS: A GUIDED EXPERIENTIAL PROCESS FOR UNDERSTANDING THE TRANSITIONS OF ILLNESS AND THE END OF LIFE, by Karen Mueller. Thorofare, NJ: Slack Inc., 2006, Game, $09.95. Reviewed by Lenore B. Weinstein.