Textbooks* collection and, later, over 20 smaller
miscellaneous archives.^[27](#fn-2025-27){#fnref-2025-27}^
In retrospect, we can categorize the founding efforts along three
parallel tracks: 1) as the development of "front-end" server software
for searching and downloading books, 2) as the organization of an online
forum for enthusiasts willing to contribute to the project, and 3) the
collection effort required to expand and maintain the "back-end" archive
of documents, primarily in .pdf and .djvu
forma