I'd love to hear about great fiction books for grade 4/5 (U.S.) children, ideally having some sort of historical aspect and a connection to a social justice theme. Bonus if it involves a connection to the theme of geology (e.g. characters working at a quarry?) I have Counting on Grace and Bread and Roses, Too if that gives you an idea of what I am thinking about. I would love to hear about more books in that vein.