This is one I remember using that I didn't see on there: Professors William T. Trotter [1] and Mitchel T. Keller [2] Applied Combinatorics [3,4] [1] http://pe

This is one I remember using that I didn't see on there: Professors William T. Trotter [1] and Mitchel T. Keller [2] Applied Combinatorics [3,4] [1] http://people.math.gatech.edu/~trotter/ http://people.math.gatech.edu/~trotter/ [2] http://rellek.net/home/ http://rellek.net/home/ [3] http://rellek.net/book/app-comb.html http://rellek.net/book/app-comb.html [4] https://people.math.gatech.edu/~trotter/book.pdf https://people.math.gatech.edu/~trotter/book.pdf