New York: Random House, 1980. Early Edition. Hardcover. 4 3/4 X 4 1/4 Inches. Very Good. Item #1677
Original 1980 boxed set including: How Superman Came to Earth, The Adventures of Superbaby, When Superman was Superboy and Superman in Metropolis. All four books are third printing copies. In original issue slipcase. A fairly scarce original set. Books are clean and sharp. Slipcase exhibits a bit of scuffing.