I recently acquired a set of World Book encyclopedia’s from 1978. Now, I know what you're thinking……….but I've found it such an interesting tool for research. The progression of our knowledge of ancient civilizations and just general knowledge of the world and how far we've come in 30+ years is really amazing. As my Girlfriend likes to say, “Use books before they take them all away”. I Also have started The History of the English Speaking Peoples highly recommend.