...on what Iliya is reading here?

The other day, I was unpacking boxes, and noticed that it had gotten very quiet in the house. That usually only means one thing...so I went in search of a small child who (I was quite sure) was up to no good whatsoever!
Indeed, he had gotten into something, but - to my surprise - it was only a box of books...and he was sitting, contentedly looking through this particular book.
Studying it, I might even say.

Want to care to guess the name of the book? The winner gets 40 bonus points!
Joy
-Sarah
Aunt Frarrel