Adam Bird for The New York Times

Tim Broekhuizen, a banker in Grand Rapids, Mich., trades books online free on BookMooch. The site has 40,000 members.

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Wendy Scholl, a student at the University of Washington, is looking for a book that will instruct her in Lakota, an American Indian language.

Tim Broekhuizen, a banker in Grand Rapids, Mich., would like a copy of Bill Bryson’s “A Short History of Nearly Everything” and several books in the Rama series by Arthur C. Clarke.

Both are members of BookMooch, a book-swapping Web site created a year and a half ago by John Buckman, a bibliophile who describes himself as a “wealthy ex-dot-com person.” He and Jan Hanford, now his wife, co-founded Lyris Technologies, an e-mail marketing software company, in 1994, and sold it two years ago for $29.5 million.