pages this far:
https://derpibooru.org/1134733?q=activity+book
https://derpibooru.org/1134735?q=activity+book
https://derpibooru.org/1134736?q=activity+book
https://derpibooru.org/1134740?q=activity+book
https://derpibooru.org/1134741?q=activity+book
https://derpibooru.org/1134738?q=activity+book
https://derpibooru.org/1135779?q=activity+book
https://derpibooru.org/1495525?q=activity+book