[DONE] Request to add cover: "The Backsack Bulletin"

[RM]

Scans taken by me of the copy I own: https://imgur.com/a/NpnBrQJ

(ISBN on copyright page appears to contains a typographical error: there's a full stop where the final 1 should be. So I've also scanned the back cover which shows the barcode and the correct ISBN.)

[Martin]

Done