New York: Ace Books Inc., 1969. First edition, first printing. Paperback. Item #34061
Ace Double book number 30300 with 60¢ cover price. The cover art is by Jack Gaughan and John Schoenherr. Night Monsters is referenced in Magill; The Literature of Fantasy 636, and The Green Millennium in Barron; Anatomy of Wonder 1981, 3-479. Mild toning to the pages. A near fine, bright, gently read copy.