As I get closer to completion on the text, I will be taking various chapters off line. I’ve already begun to do this. This is in preparation for the upcoming book version that I hope to have finished by the end of the year. If you want to help support the project, go to https://www.gofundme.com/bandestration and consider donating. Every donation gets me a step closer to making volume 1 of the textbook a reality.