org) is a nonprofit
organization, chartered by the U.

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, Cadmus Communications
Corporation (Nasdaq: CDMS) today announced that the American Chemical Society
(ACS) has signed a multi-year contract extension for printing and related
services. "We are pleased to extend and expand our relationship for the
future. It publishes
numerous scientific journals and databases , convenes major research
conferences and provides educational, science policy and career programs in
chemistry.

Sigma-Aldrich Corporation Annual Shareholders Meeting

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We have customers in life science companies, university and
government institutions, hospitals and in industry.

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"

ABOUT THE ACS
The American Chemical Society (http://www.

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, and Columbus, Ohio.

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"Cadmus'
dedication and focus on the scholarly publishing market is clearly evident
throughout the organization and is a key reason that ACS continues to rely on
Cadmus for support of our publishing program.C.streetevents.

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Its main offices are in Washington, D.
For more information about the innovative technologies and products developed
for publishers by Cadmus, visit http://www.

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About Sigma-Aldrich
Sigma-Aldrich is a leading Life Science and High Technology company.

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American Chemical Society Signs Multi-Year Contract Extension With Cadmus Communications

"
"ACS and Cadmus have had an ongoing relationship since 1996 and we are
honored to support such a market leader in its mission of disseminating
critical scientific content," said Steve Hare, President of Cadmus ' Publishing
Services Group.com , Thomson/CCBN's
individual investor portal, powered by StreetEvents .

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Central Time).

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Cadmus is the world's largest provider of content
management and production services to scientific, technical and medical
journal publishers, the fifth largest publications printer in North America,
and a leading national provider of specialty packaging products and services .

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RICHMOND, Va.acs.com ).

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Eastern Time (11 a.

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Multi-year agreements enable us to plan, invest and work more closely
in a strategic partnership with the customer on initiatives to increase
efficiency and effectiveness.
The webcast is also being distributed through the Thomson StreetEvents
Network to both institutional and individual investors. For more
information about Sigma-Aldrich, please visit our award-winning web site at
http://www.

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ABOUT CADMUS
Cadmus Communications Corporation provides end-to-end, integrated graphic
communications services to professional publishers, not-for-profit societies
and corporations.
This call is being webcast by Thomson/CCBN and can be accessed at
Sigma-Aldrich's web site at http://ir.
We are committed to the success of our Customers, Employees and Shareholders
through leadership in Life Science, High Technology and Service.

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The ACS, the world's leading society publisher of scientific
content, has relied on Cadmus for the printing and distribution of its 32
scholarly journals for many years.
"We look forward to continuing our strong relationship with Cadmus as we
address the serious challenges facing today's journal publishing environment,"
stated Bob Bovenschulte, President of ACS' Publications Division.

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LOUIS, Sigma-Aldrich Corporation
(Nasdaq: SIAL), will hold its Annual Meeting of Shareholders on Tuesday,
May 3, 2005, at 12:00 p. Our
biochemical and organic chemical products and kits are used in scientific and
genomic research, biotechnology, pharmaceutical development, the diagnosis of
disease and as key components in pharmaceutical and other high technology
manufacturing.

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Congress, with a multidisciplinary
membership of more than 159,000 chemists and chemical engineers. Institutional investors
can access the call via Thomson's password-protected event management site,
StreetEvents ( http://www. Over one million
scientists and technologists use our products . Sigma-Aldrich operates in 35
countries and has over 6,500 employees providing excellent service worldwide.