Who owns which company

It's hard sometimes to keep up with which groups bought which publishers. AALL's CRIV (Committee on Relations with Information Vendors) has a way to look up this information.

From their page:

A Legal Publishers List: Corporate Affiliations of Legal Publishers, 2d ed.
The publishers in the Legal Publishers List are divided into five groups, which are on five separate web pages:

• Thomson
• Reed Elsevier
• Wolters Kluwer
• Other Publisher with Subsidiaries
• Independent Publishers

The lists may be found at http://www.aallnet.org/committee/criv/resources/tools/list/.