Only the current version so far — new entries appear as the app ships updates.
Bookstores.app: compare prices is a books & reference app by Bookstores.app with 100,000+ downloads (about 397K estimated). +119 installs in the last 7 days. Rated 4.5 from 2.5K ratings. Released Dec 27, 2016. Install growth, rank history, SDKs and ad networks.
From the store listing: “Compare popular bookstore deals: Book Depository, Blackwells Books and more.”