Seadawg, cheap or not most of these books are so packed with information they're worth having a physical copy on hand. "Teeming with microbes" is another common suggestion. I like Rodale's book on composting as well.
I like to read pretty much anything that'll make my grow better. And have read quite a bit already. Most that i have read i was lucky enough to get free. But some i had no choice but to pay. If its worth it i dont mind. But some books like "vermiculture technology" are more expensive than some of my grow equipment lol.
I actually have both of those two that you've suggested. And you're right those two are packed with solid information and are beneficial beyond initial assumption.
Thank you greatly
SD