I ordered a couple of "books" from Heartcry, written by Paul Washer, thinking they were just books. As it turned out, they are Bible studies, and very good ones at that. I completed "The Truth about man", and am now working my way through the longer of the two, "The One True God."
I know many here have been blessed by the preaching of Paul Washer, as I have, and thought some of you might like these 2 studies.
This is the FAQ page, and the books are listed on #5: