Thank you all for being so welcoming!
I happened to be in a used bookstore last night and while I didn't find "Taking Charge of Your Fertility", I did find a book that was copyrighted in 1980 called "The Ovulation Method of Birth Regulation". I'm hoping it has some good information! I still plan on getting the other book, I just saw that one
I also found a book from 1989 called "How to Choose the Sex of Your Baby" and a 1996 book called "Guide to Fertility and Reproductive Health" from the American Medical Women's Association.
Now just to get a thermometer...