The Four Amber Novels paperback slipcase box set by Roger Zelazny, published by Avon Books in 1978.-USED VG

While the series eventually grew to ten books, this specific slipcase collects the first four seminal novels of the "Corwin Cycle" in uniform Avon paperbacks:

1. Nine Princes in Amber (1970)

2. The Guns of Avalon (1972)

3. The Sign of the Unicorn (1975)

4. The Hand of Oberon (1976)

(Note: The fifth book, The Courts of Chaos, was published in 1978, right around the time this specific box set was hitting shelves, which is why it only contains the first four.)