This unsigned book, which was renamed by an anvil, called here as hello_there__dyntylluan.md, is a book that was found in a trading hall in mc.neozones.club at -51 / 81 / -153 in the overworld.
It was written by DynTylluan.
This book makes refrence to Reddit user hmjerred, who had made a few posts on r/GoldenAgeMinecraft.
Hello, I am glad that you are reading this book, hopefully you found it in this world rather than the github.com/DynTylluan/mcbooks mirror of it so you can see what this room looks like.
This building was made by Cass Python, with help from vanta black with inspiration from
hmjerred on Reddit, who posts a lot on r/GoldenAgeMinecraft