Andrew Loomis' classic art instruction books, long out of print, have been republished in beautiful facsimile editions by the British publishing house Titan Books.
With wonderful quality reproductions and a strong secure hardcover binding, these aren't just cheap copies, but top-of-the-line re-publications.
I highly recommend that you get them while you can. Both Barnes & Noble and Amazon have them for less than $30 apiece.
Loomis at Amazon.com
Loomis at BarnesAndNoble.com