Great piece, as it shows who the original Bonanza cast of Lorne Greene, Dan Blocker, Michael London and Parnell Roberts as Adam, who left after the sixth season. Gouache on artist board is the original cover painting and measures 9" x 11", and is accompanied by a large artist's proof of the cover, 13" x 17". Both items are nicely matted under glass in a metal frame with an overall dimension of 27 3/4" x 21 1/2". A stamped signature of the noted illustrator Robert Doremus appears on both items, and the coloring book was published by Saalfield Publishing / Artcraft. Condition is Near-Mint or better. From the Saalfield Find of their original cover art, here in this auction are two of the best pieces.