I had posted this link in the Benton thread but felt its well worth a separate thread.

Granted, there are only a few paddlers in Steve Lund & Bill Hathaway's book but for anyone interested in modeling American Civil War ironclads, this is a excellent reference to have. 

http://walternelson.com/ironclads.pdf

They are both great guys to know so if you happen to be in the Los Angeles area, you'll want to look them up.