The Dragon in the Lake:
North America's Most Controversial
Underwater Archeological Discovery
of the 20th Century
by Archie Eschborn
paperback
I saw a thread about that book & it sent me looking to find out where the lake is.
http://www.rocklakeresearch.com/gallery.htm
On another page at that site, maybe it's just me, but the "history" link at that site seems way, way too far fetched.