Thousands of books were kept in the Blackside office as an "internal library" used for reference purposes. The titles have been cataloged into Washington University's library system. A complete listing of the books can be found in the catalog  by searching for "Blackside" as the author; see:

http://catalog.wustl.edu/search/a?searchtype=a&searcharg=blackside&SORT=D&searchscope=2&submit=Search