"Logic and Discrete Mathematics for Computer Scientists", by James Caldwell. Manuscript Date: August 22, 2011. Available at: http://www.cs.uwyo.edu/~jlc/courses/2300/book.pdf.
"Data Structures and Algorithms, The Basic Toolbox", by Kurt Mehlhorn. Manuscript Date: August 2008. Available at: http://www.mpi-inf.mpg.de/~mehlhorn/ftp/Toolbox/.
"An Introduction to Graph Theory and Complex Networks", by Martin Van Steen. Manuscript Date: January 2010. Available at: http://www.distributed-systems.net.
"Category Theory for Computing Science," by Michael Barr and Charles Wells. Available at http://www.tac.mta.ca/tac/reprints/articles/22/tr22.pdf.
"Philosophy of Computer Science," by William J. Rappaport. Manuscript Date: December 24, 2013. Available at: http://www.cse.buffalo.edu/~rapaport/Papers/phics.pdf.
"Fractional Graph Theory: A Rational Approach To The Theory Of Graphs," by Edward Scheinerman And Daniel Ullman. Available at http://www.ams.jhu.edu/~ers/fgt/fgt.pdf.