Nightfall.

First limited edition of this standalone science fiction novel. Octavo, original publisher's half-cloth with gilt titles to the spine, gilt stamped facsimile signatures of the authors on the front panel, top stain purple, ribbon bound in. One of 750 numbered copies, this is number 256. Boldly signed by Isaac Asimov and Robert Silverberg on the limitations page. In fine condition. Housed in the original publisher's slipcase with an onlay of an eclipse to the boards.