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Above the Treeline’s Edelweiss digital catalog service is racking up some big name clients. Today, the company announced that Houghton Mifflin Harcourt has signed with the Edelweiss service for Web-based digital catalogs. Last week, Macmillan also signed on.

Both Houghton’s Trade and Reference divisions will have their fall 2010 catalogs viewable on Edelweiss by the end of May.