The Bentley Historical Library has put the University of Michigan Law School Class Photographs from 1873 to 1966 online. (The composite practice was discontinued in 1966.) No composite photos have been found for 1874, 1876, 1944, 1945, 1959 and 1965. Extra bonus points for identifying the future dean of two Michigan law schools and the best evidence professor in the history of legal education.
When you've mastered this composite, you can move on to this one, and try to spot a future American Bar Association president.