The Association of Magazine Media announced today that 11 of its member companies, among them Des Moines-based Meredith Corp., have come together to raise awareness about Let Girls Learn, a U.S. government initiative launched in March 2015 to expand access to education for adolescent girls worldwide. A total of 65 magazine brands are donating advertising space to the campaign, which the association said will be the largest donation of ad space in its history. Expected to reach more than 60 percent of U.S. adults, the campaign is led by first lady Michelle Obama, who earlier this year participated in a panel at the American Magazine Media Conference in New York that highlighted the ability of multichannel magazine media to raise awareness of critical issues facing society. Three public service announcements will begin hitting newsstands and subscribers' mailboxes this month.