$20.00 *New Book of Knowledge Grolier Heirloom - 17 Volumes *White hardbound cover with Blue accent on Gold ink (17) Volumes: 1-7 + 9-14 + 16-18 + 20 (4) Missing Volumes: 8 + 15 + 19 + 21 *$20.00 /set = $1.1764 per book