"Sign Language Made Simple, Second Edition" by Edgar D. Lawrence (ISBN 0-88243-500-0) and "Signing Illustrated: The Complete Learning Guide" by Mickey Flodin (ISBN 0-399-52134-8). Both books focus on teaching American Sign Language. "Sign Language Made Simple" features an introduction by Ruth A. Reppert and is a hardback. "Signing Illustrated" is a softcover edition that includes over 1,350 signs and is supplemented with practical learning tools.
Covers and spines show some handling wear consistent with use. See photos for measurements, if taken.