The library acquires two copies of books written or edited by Trinity University faculty members (one copy for special collections and one for the circulating stacks), but generally speaking, it does not buy more than one copy of a given edition of a book, video, CD, etc. If there is evidence of unusually high and ongoing need for a particular item, additional copies may be bought on a case-by-case basis. The library also does not usually add donated materials which duplicate items already in our collection.
Exception: Duplication of content sometimes occurs when both the print and electronic versions of a book are bought. This duplication is not intentional, and the library makes every attempt to minimize such duplication.