Article Photos: AP PHOTOS: A look at jobs replaced by technology 12/12

This combination of Associated Press file photos shows Steven Herman, left, head of the Library of Congress storage facility, at the Library of Congress in 2003, in Washington,  and right, a "bookBot", an automated retrieval system at the James B. Hunt Jr. Library at North Carolina State University in 2013, in Raleigh, N.C. Many middle-class workers have lost jobs because powerful software and computerized machines are doing tasks that only humans could do before. (AP Photo)