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Dialog and CAS Agree to Offer CA Search® File Users Options for Ordering CAS Abstracts Through Dialog®Web-Guided Search

LOS ANGELES, June 10, 2002 — Dialog, a Thomson (TSX:TOC) business and a leading worldwide provider of online-based information services and integrated information solutions, today announced that it has reached an agreement with Chemical Abstracts Service (CAS) to provide users of its DialogWeb-Guided Search service with the capability to order displayable abstracts of journal articles, patents and other documents published by CAS.

DialogWeb-Guided Search users will soon be able to request and then purchase multiple corresponding full abstracts when searching CA Search files (file numbers 308-314, 399), which include more than 16 million bibliographic references and indexing in chemistry and related science (from 1967 onward) produced by CAS. This new capability is expected be available later this summer.

Dialog made the announcement at the 93rd Annual Conference of the Special Libraries Association, meeting here June 8-13.

Abstracts of the material covered by CAS include critical scientific research, regulatory and patent resources for a wide range of scientists, researchers, engineers, paralegals, intellectual property managers and others. The abstracts also are important to information professionals and others supporting them in the chemical industry and related fields, such as agricultural sciences, biotechnology, life sciences, medical research and many others. Dialog, as one of the world's largest aggregators of scientific, academic and business information, also offers a tremendous range of other information required by its customers in the chemical and related fields.

"We are delighted to be offering our customers access to this highly valued information," said Dialog Senior Vice President of Product Development Paul Colucci. "We have worked closely with CAS for years, and are excited now to extend that relationship for the benefit and convenience of our users in the scientific, medical and technology communities around the world."

Added CAS Director of Marketing Suzan A. Brown, "We are pleased to be working with Dialog on this new development. Soon users of the CA Search file on DialogWeb-Guided Search will be able to conveniently order abstracts from CAS. We believe this will increase the availability of our world leading scientific information within the broader business community."

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About Chemical Abstracts Service
CAS (www.cas.org), a division of the American Chemical Society, is an organization of scientists creating and delivering the most complete and effective digital information environment for scientific research and discovery. CAS provides pathways to published research in scientific journals and patent literature – virtually everything relevant to chemistry, plus a wealth of information in the life sciences and a wide range of other scientific disciplines as far back as the beginning of the 20th century. CAS publishes the print version of Chemical Abstracts (CA), related publications and CD-ROM services; operates the CAS Chemical Registry; produces a family of online databases; and offers the SciFinder desktop research tool. CAS operates STN International, a network of scientific and technical databases, in association with FIZ Karlsruhe in Germany and the Japan Science and Technology Corporation.

About Dialog
Founded in 1972 by Dr. Roger K. Summit, a pioneer in developing the technology behind electronic information retrieval, Dialog is the world leader in providing online-based information services to organizations seeking competitive advantages in such fields as business, science, engineering, finance and law.

Today, Dialog's three online platforms — Dialog®, Profound® and DataStar™ — offer users the ability to precisely retrieve data from more than 1.2 billion unique records, accessible via the Internet or through delivery to enterprise intranets. The content available ranges from articles and reports published in thousands of publications to in-depth repositories of patents, trademarks and other intellectual property data.

Corporate librarians, knowledge managers and other information professionals at more than 25,000 business, professional and government organizations in more than 100 countries prize Dialog services for their depth and breadth of content, precision searching and speed.

Headquartered in Cary, N.C., USA, with direct operations in 32 countries throughout North American, Latin America, Europe, the Middle East, South Africa and the Asia Pacific, Dialog is a business of The Thomson Corporation. For more information about Dialog, please visit www.dialog.com. Or, please call (U.S./Canada) 800-3-DIALOG or (U.S.) 919-462-8600. Dialog's London office may be reached at (44) (0) 207-940-6900.

About The Thomson Corporation
The Thomson Corporation (www.thomson.com), with 2001 revenues of $7.2 billion, is a global leader in providing integrated information solutions to business and professional customers. Thomson provides value-added information and technology to more than 20 million users in the fields of law, tax, accounting, financial services, higher education, reference information, corporate training and assessment, scientific research and healthcare. The Corporation's common shares are listed on the Toronto stock exchange (TSX:TOC).

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