Hello,

My name is Sara Luecke and I am an exhibit researcher at the Science Museum
of Minnesota.  I am looking for some freshwater bivalve shells to use in an
upcoming exhibit.  The species that I am looking for is Unio tigridis or
possibly Unio terminalis or Unio crassus.  Does anyone know where it might
be possible to buy or borrow some of these shells for use in a museum
exhibit?

Thanks!