More details have emerged about the letter sent from the American Association of Advertising Agencies to the MPA concerning the need for more data on readership of magazines on tablets. The 4A's wants a breakout of single-issue and often complex subscription sales, a third-party measurement system and a template that would span all publishers. The group also requested a way of finding total reach stats that would include all interaction with specific brands and a disambiguation between digital and print editions, among other requests.

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