Can I share one of my favorite resources with you? It's Christine Miller's outstanding work:
"All Through the Ages".
What a work it is! All the living book titles you could ever want, organized in several different ways: all of them by grade level (1-3, 4-6, 7-9 and 10-12), and in chronological order and geographical history. The histories of Science, Mathematics, Visual Arts, Music, Western Civilization and the Christian Tradition are also included.
Planning units or read alongs is SO easy with this resource! I wish I had found it earlier in my homeschooling career. Please do yourself a favor and buy this book. It's one resource I think *every* homeschooling family should have on their shelves.