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Shelton, Conn.—About a third (33.8%) of the b2b and consumer publications audited by BPA Worldwide reported digital circulation for the second half of last year, the organization said. A total of 520 print titles reported digital circulation for the six-month period ended Dec. 31, a 2.8% increase over the year-earlier period. BPA Worldwide said digital circulation now accounts for about 22% of its audited qualified circulation.