I haven't seen it in person, but I assume it must be on her former residence at 837 W. Ainslie. Her being Margaret Anderson.
Uptown Library on Buena?Margaret Anderson.
Margaret Anderson is correct and here you can learn more about her:http://www.glhalloffame.org/index.pl?item=260&todo=view_item
Congrats to Katrina, who got both parts of the question."As founder of The Little Review, Margaret Anderson introduced the nation to avant-garde ideas and authors such as James Joyce, Gertrude Stein, and Ezra Pound."She lived at 837 N Ainslie when she started the magazine in 1914, with her life partner, Jane Heap. There's a Chicago "Marker of Distinction" there in her honor (the only one in Uptown, and one of only three markers north of Irving Park).