issue of a periodical used by a publisher to supply statistical information for the required biannual ABC statement and presumed to be representative of all issues during that six-month period. The Business Publications Audit of Circulations organization requires that the May and November issues be used. The Audit Bureau of Circulations , on the other hand, allows publishers to select two issues of their choice, enabling them to choose issues that are expected to sell in a quantity closest to the rate base . The information reported on each analyzed issue includes both subscription and newsstand sales data.