Kass's Journal

is an BotW: in.

Location and Uses
Kass's Journal is found within a hut on a tree located on BotW:. It's written by BotW: and is used to record rumors he's heard about ancients songs throughout BotW:. The contents of this journal reveal all the locations Kass can be found, where he will provide NaN Shrine Quests, as well as one BotW:.

Transcription
The ninth page only appears one Link has heard Kass's song at BotW:.