Checkpoint Lambda by Murray Leinster 1966 Berkley F1263 Paperback. An unmarked, clean, and solid copy in VG condition. See photos.Checkpoint LambdaSKU: 285036708180 $8.00 Regular Price$7.20Sale PriceQuantityAdd to CartBuy NowAuthorMurray LeinsterPublication Date1966ISBNConditionUsedPublisherBerkley