Our Elf is Back!

Last year, Seuss, our library "Elf on the Shelf" made his debut appearance at Woodstone (read about that here).  He arrived back in our library the Monday after Thanksgiving with a new task for us. This year, he was going to be reading nonfiction books each night and leaving us clues to what Dewey section he visited.  I have the same contest going.  Kids submit their answers on my library page and when we come back from the winter break I will draw a few names for some prizes.  Here are a few of our elf nonfiction clues.  Can you figure out the call number?