DS6 has loved using the Usborne encyclopoedia too - hubby says it really provides a good review of everything they have done in SOTW. He also ordered the Kingfisher Encyclopedia and loves that. I think the hands on aspects of SOTW - making the clay models and coloring the pictures we got a Ben Franklin for Egypt have really solidified everything. Don't know what I would do if DS6 didn't like SOTW though! That would be tough!