Rivers assignment

I had two FTS students in Laura Triplett's class come in asking for books about rivers Wednesday morning. It seemed, on further investigation, that articles would be okay, which is a good thing because we don't have a huge number of books exclusively about particular rivers. One went away happily looking at fairly technical articles in Academic Search Premier on geology-type topics related to the Congo River. The other found an essay in a book about historical/social aspects of the Tiber river. I hope they know what they're doing, because I didn't see an actual assignment and am not sure if they can pick any aspect of a river. They each had different ideas, though seemed not too panicked about meeting particular expectations.