CHICAGO, IL – DECEMBER 17: Copies of The Anarchist Cookbook by William Powell sit on a shelf behind the counter in the reference section of the Harold Washington Library on December 17, 2013 in Chicago, Illinois. William Powell, who published the book in 1971 at the age of 19, has requested the book be taken ‘quietly and immediately out of print’, after discovering that the book was studied by the student who recently opened fire at Arapahoe High School in Colorado, Powell. (Photo by Scott Olson/Getty Images)