These volumes are listed for $125 on abebooks.com by Books-n-things:
"Houghton Mifflin, 1907. Hardcover, Red cloth bindings with gold lettering and decor, all in very good condition, with minor soiling, missing vol 4, contents are clean unmarked, and tightly bound, sold as a set,"
You have all volumes so you could list for more... maybe $150+. A rare book collector may be interested.
Thanks for the submission. Sorry it took so long. Bob
