This bibliography is a selected compilation of resources at the National Agricultural Library about heirloom apples. It lists books and reports dating prior to 1928, with the addition of later books which focus on the subject of varieties of apples grown in the American past. It was prepared in conjunction with the presentation “Celebrating America’s Unique Apple Diversity: A Roundtable Discussion Featuring Some of America’s Leading Apple Experts,” held on September 17, 2010, to mark 2010 as the Year of the Heirloom Apple.