Hi bdn2004,
The Brown Book is an excellent reference book to have in your library.
The (member) price that I received form the IEEE website for the latest version of the Brown book is;
$161 US for the pdf version
$186 US for the hardcopy version
I have a copy of the latest version (1997), but do not have a copy of the superceded versions.
For now, why not buy the older version for $15? [ Nothing ventured, nothing gained! ] If your online course follows this textbook very closely, the older version may put you at a disadvantage.
Another (hardcopy) book that I Have in my home library is the "Industrial Power Systems Handbook: By Beeman (circa 1955 McGraw-Hill). I reference it quite frequently.
GG
"I have not failed. I've just found 10,000 ways that won't work." Thomas Alva Edison (1847-1931)