Book Puzzles

[MoLikesPoe]

When it comes to the four book puzzles you have to solve to

get the code to the roll-top desk in the tower

, I have already figured out:

The island The Hydroponics book Ersatz Quidnuncs

But I am having trouble with the last two. No spoilers, please, just some guidance.

[Carson.Drew]

The four you need to find are:

Nautical Cartography, Zoopraxiscope, Hydroponics and Aeroponics, Ersatz Quidnuncs

The answers for the ones you are confused on, I believe, are just hidden in the riddles themselves.

[MoLikesPoe]

I knew where the books were. I guess I was just over thinking them. Thanks!

The four you need to find are:

Nautical Cartography, Zoopraxiscope, Hydroponics and Aeroponics, Ersatz Quidnuncs

The answers for the ones you are confused on, I believe, are just hidden in the riddles themselves.