Records of the United States War Ballot Commission. Preliminary Inventories No. 24. by Robert W. Krauskopf; Records of the Office of War Mobilization and Reconversion. Preliminary Inventories No. 25. by Homer L. Calkin; Records of the Bureau of Aeronautics. Preliminary Inventories No. 26. by William Shonkwiler; Records of the Selective Service System, 1940-47. Preliminary Inventories No. 27. by Richard G. Wook; Records of the Retraining and Reemployment Administration. Preliminary Inventories No. 28. by Thayer M. Boardman; Records of the Foreign Economic Administration. Preliminary Inventories No. 29. by H. Stephen Helton; Records of the War SHipping Administration. Preliminary Inventories No. 30. by Allen M. Ross