When I showed this resource to one of our library patrons, that’s what she told me. Credo Reference is a huge conglomerate of reference books that can be searched as group, or one at a time. Here’s what came up when I searched “olympics” in all the encyclopedias and asked for the results as a concept map.
Each oval clickable, and you can see the relationships between ideas about the olympics. What an easy way to hunt for topics for reports! Try it out for yourself.