Fred, I just checked out this site yesterday, a year or so back collected some mussels at Lake Huron, still need ID. I believe you can order the book from there. Kris NJ <>< <A HREF="http://www.inhs.uiuc.edu/cbd/musselmanual/announcement.html"> Freshwater Mussels of the Midwest - Book Order Information</A> http://www.inhs.uiuc.edu/cbd/collections/mollusk.html