This database consists of book buyers on professional topics for which Info Solutions has not created a separate database. These topics include anthropology, arts, astronomy, biology, chemistry, geography, linguistics, literature, mathematics, music, philosophy, physics, sociology, theology, and many others. These buyers purchased one or more books from offers made by direct marketing means during the last 18 months. As soon as the number of book buyers in each of the above mentioned topics becomes substantial, Info Solutions will separate them into a new database of buyers of books on that particular topic.