

References
^ William Bruce Wheeler, Merry E. Wiesner-Hanks, Kenneth R. Curtis, Franklin Doeringer, Julius RuffDiscovering the Twentieth-Century World : A Look at the Evidence by Kenneth R. Curtis, William Bruce Wheeler, Merry E. Wiesner-Hanks, Julius Ruff and Franklin Doeringer (2004, Paperback) ISBN 9780618379316 (revised Mar 2023)^ Wiesner-Hanks, Merry E.; Ruff, Julius; Wheeler, William Bruce; Doeringer, Franklin; Curtis, Kenneth (2015). Discovering the Twentieth-Century World A Look at the Evidence, Cengage Learning. BiggerBooks. ISBN 9780618379316 (revised Feb 2024)
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