Author Linda P. Brown is co-author of "Birthbond: Reunions between Birthparents and Adoptees--What happens After." In the 1960's BROWN gave up her own daughter for adoption. The book is based on interviews with 30 birthmothers -- from a variety of backgrounds -- who were reunited with their adult children. And it looks at the challenges these mothers face after the reunion. "Birthbond" is published by New Horizon Press, Far Hills, N.J. (Interview by Sedge Thomson)