 Under Powell's leadership, the "Britannica" began to capitalize on its reputation by aggressively developing "spin-offs", such as the 12-volume "Britannica Junior" for children (published 1934, and revised to 15 volumes in 1947), the historical timeline "The March of Man" (published 1935, and edited by Albert Bushwell Hart, Isaac J. Cox and Lawrence H. Dawson), the "Encyclopædia Britannica World Atlas" (published 1942, and prepared by G. Donald Hudson) and "10 Eventful Years", a summary of the national and international events surrounding World War II (1937–1946).Sears Roebuck published the "Britannica" until 1943.In 1941, Sears offered the rights to the "Britannica" as a gift to the University of Chicago.