For sale is THE INTERNATIONAL COLLECTION OF WORLD WILDLIFE FIRST DAY COVERS.  Authorized by the World Wildlife Fund and certified May 20, 1976.  Large leather binder, containing 48 pages with 3 first day covers (stamped envelopes) per page.  Total: 144 covers.  Each cover and informational card is held in an individual, clear-plastic sleeve.  This heavy book is roughly 10.5 x 13.25 x 3.25 inches in size.  Very Good condition.  The covers have a few light scuffs.  The back cover has a small tear/crease (see the fourth photograph).  The covers and cards are like new--clean and sharp.  A terrific set for stamp collectors!