The launch issue of Exploring History, a brand extension from National Geographic, performed exceptionally well, according to a recent article in The New Single Copy, by John Harrington.
The issue, which went on sale in September of 2011, sold 103,000 copies in North America, at a 45% efficiency. Their second issue, featuring Ben Franklin went on sale in November of 2012.
We blogged about it here: https://www.coverssell.com/?p=4136