FYI.  This link might be useful on some mollusk web sites.
Marian E Havlik
Malacological Consultants
1603 Mississippi Street
La Crosse, Wisconsin 54601-4969 USA
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P/F: 608.782.7958
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Available from USGS, Upper Midwest Environmental Sciences Center, La Crosse,
Wisconsin, USA, or is downloadable (PDF version, 2 pages) at:

     http://www.umesc.usgs.gov/reports_publications/psrs/umesc_psr.html

PSR 2000-04 "Native Freshwater Mussels of the Upper Mississippi River System"
 by Marian Havlik and Jennifer Sauer.

Project Status Reports (PSR) are a quick (1 page) means of keeping our
various audiences informed about our scientific activities.  PSRs originated
as an Long Term Resource Monitoring Program publication but, since the
merger, have expanded to cover all Upper Midwest Environmental Sciences
Center activities. They are similar in nature to the old Research Information
Bulletins (RIBS) many of you may remember. The PSRs have undergone a minor
face-lift with a redesigned header and different paper stock.

Mark Wenger, PSR Coordinator
USGS-Upper Midwest Environmental Sciences Center
2630 Fanta Reed Rd.
La Crosse, Wisconsin 54603
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608-781-6251 (Voice)
608-783-6066 (Fax)