Catalpa tree, or Indian bean tree

Probably a silly question, is the catalpa tree a nitrogen fixer? It doesn't have long long "bean" pods so I am assuming it is, just figured I'd ask the professionals ;)

Eric Toensmeier characterises the Catalpa as a "low nitrogen fixer" . http://www.perennialsolutions.org/all-nitrogen-fixers-are-not-created-equal

Thank you sir. I did visit this page but I cannot see the tables in entirety, I'm viewing from a smart phone so for some reason its cuts off the whole right side of the tables.