It’s not a carefully curated collection, just a shelf full of maybe about 100 nonfiction books that are related in some way to history or geography (since in my classroom this activity is part of history class). I brought roughly 1/3 of them from my personal library, and the rest were rescued from the storage to which they were relegated from our school library a couple years ago because nobody was checking them out (sad…). There’s a wide variety, from middle-school-level biographies to missionary stories to tomes from historians like Barbara Tuchman and Bernard DeVoto. My goal was to make sure each student has plenty of options.
That doesn’t answer your question directly, sorry. Early next week I can list the books students read that week to give you a more specific answer, at least partially.