first, go to tanglevine jungle
the book is in the little island thingy
then when u click on it u have to answer some questions(credit to iiROCK, i couldn’t remember the questions/ answers):
Which of Archimedes’ books is about plants?
Which of Archimedes books is about the ocean?
Which of Archimedes books is about geology?
-The layers of the Earth’s crust
after that u get the book! now u have to go see articus frost in the Icy Aerie(u have to make sure u have the key first)
when u get there, click on arcticus he thanks u for it
then u get the mission completed, and 300 coins