CARY, N.C., USA (June 13, 2005)

Dialog, a Thomson (NYSE: TOC; TSX: TOC) business and a leading worldwide provider of online-based information services and integrated information solutions, and research publisher CSA announced today that they have signed a new content agreement.

More than 30 CSA files of scientific and technical research are being added to Dialog services throughout 2005, the companies said. The CSA databases will be offered through Dialog to the corporate and government markets.

"We're delighted to be working with CSA to bring its outstanding content to Dialog users," said David Brown, Dialog DataStar general manager. "For more than three decades, Dialog has been the world leader in providing access to a comprehensive portfolio of scientific, technical and medical research from around the world. We will continue to maintain that leadership position by adding unique, high-value content like CSA to our services."

Three CSA databases — CSA Technology Research Database, CSA Aerospace and High Technology Database and METADEX — are available for subscription through Dialog now.

Dialog is the only content aggregator currently offering CSA Technology Research Database. This comprehensive mega-file comprises three categories of content — engineering, high technology and materials research. CSA Aerospace and High Technology Database provides unique coverage of research in aeronautics, astronautics and space sciences. METADEX is a complete source of metals and alloys information.

Other CSA databases to be added include files composed of research on engineering, environmental sciences, life sciences, materials, social/library sciences and technology. When fully loaded, the new CSA files will nearly double the amount of CSA content that previously had been available through Dialog.

"We believe offering CSA content via Dialog will provide great value for researchers. CSA is very pleased to be working with Dialog again to provide more value to researchers," said Matt Dunie, president of CSA.

Custom CSA report templates, e-Journal Links and links to related research materials are available for CSA files. Searchers can use the custom templates to quickly process their research into a desired format for distribution to customers, managers and others in their organization.

In addition to the newly offered CSA files, Dialog online services provide access to more than 480 million documents of scientific, technical and medical research, including scholarly and professional literature, conference proceedings, business and government research reports, business directories, news and more. Dialog also offers a comprehensive array of intellectual property research, including patent and trademark records from around the world.

CSA, formerly known as Cambridge Scientific Abstracts, is a unit of Cambridge Information Group.

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About CSA
CSA has been an innovator and leader in publishing and distributing quality abstracts and indexes for over 40 years. A worldwide information company, CSA's products and serve as a guide to researchers, faculty, librarians and students enabling discovery and aiding the identification, management and organization of quality information. CSA specializes in publishing and distributing, in print and electronically, over 100 bibliographic and full-text databases and journals in four primary editorial areas: natural sciences, social sciences, arts & humanities, and technology. A privately held company, CSA is headquartered in Bethesda, M.D., USA and has offices throughout the U.S., Canada, Latin America, Australia, Hong Kong, Japan, Europe and the U.K. Researchers in more than 4,000 institutions worldwide use CSA information resources and CSA's print journals are used in more than 80 countries.

About Dialog and The Thomson Corporation
Dialog, a pioneer in developing the technology behind electronic information retrieval 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, the online services provided by Dialog — offered through the Dialog®, Dialog Profound®, Dialog DataStar®, Dialog NewsEdge® and Dialog Intelliscope® brands — give users the ability to precisely retrieve data from more than 1.4 billion unique records, accessible via the Internet or through delivery to enterprise intranets. Searchable content includes articles and reports from thousands of real-time news feeds, newspapers, broadcast transcripts and trade publications, plus research reports and analyst notes providing support for financial decision-making, as well as in-depth repositories of scientific and technical data, patents, trademarks and other intellectual property data. Information professionals and end-users at business, professional and government organizations in more than 100 countries prize Dialog services for their depth and breadth of content, precision searching and speed.

Based in Cary, N.C., USA, Dialog has operations in 27 other countries. Dialog (www.dialog.com) is a business of The Thomson Corporation (NYSE: TOC; TSX: TOC). With 2004 revenues of US$8.1 billion, Thomson (www.thomson.com) is a global leader in providing integrated information solutions to business and professional customers

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All designated trademarks used herein are the property of The Dialog Corporation or its subsidiaries. Registered marks are registered by The Dialog Corporation or its subsidiaries with the U.S. Patent and Trademark Office. All other marks are trademarks or registered trademarks of their respective owners.

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