By Louis Joughin and Edmund M. Morgan. Introduction by Arthur M. Schlesinger. The authors are professors; this is a history of the case that takes the "Sacco and Vanzetti were victims of era hysteria" view.
The paperback is a bit grubby -- edgewear, toning to pages and covers, stickers and sticker ghosts, and some stamps/writing on the flyleaf. But it's a fine reading or research copy.