vhf/free-programming-books — pull request #920 by jeffdc (2014-04-20 20:32:35+00:00)
Title: Re-added Category Theory for Computing Science with updated link.

Previous link was dead and was deleted as part of https://github.com/vhf/free-programming-books/commit/b55bf481a1b36e6d8aff8d153101723be49b8de7