You might want to take a look at some of the links listed on the 9th Infantry Division's website (http://www.oldreliable.org
). There are several good websites that contain Riverine Force photographs including pictures of the various types of rivercraft. Also, there is a link on my webpage to a site about the Riverine Force in miniature (the guy whose site it is scratchbuilds the various types of rivercraft in 1/35th scale). These sites should give you a starting point. You can also contact me offline if you need further assistance.