1960's. The Illustrated Encyclopedia Of Animal Life, The Animal Kingdom by Greystone Press. Full set. The first 5 are in rough condition on the binder cover, but the rest are in okay condition. The front and back covers are in excellent condition. The pages and pic within are in far better condition. Selling on Ebay for $7-$12 per book. Clearing out storage and do not wish to discard. Will think about any real offer however must choose up. Can send out even more photos if needed.