Series III contains the records of the Construction Division. Sub-series A contains the Wilmington Shops order books. These volumes document job orders received and completed by the shop, mostly involving routine fabrication and repair of production machinery. Sub-series B contains defense construction files. These files include correspondence of chief engineer Everett G. Ackart regarding national defense construction projects and correspondence of R.E. Burton, manager of the Control Division, regarding Atomic Bomb Program Awards presented by the Army Corps of Engineers. Also included in these files are monthly payment estimates and correspondence regarding the construction of the Hanford Engineer Works. Sub-series C contains war construction project histories. These reports document the design and construction of facilities owned by the United States government for the manufacture of various military explosives, as well as the conversion of DuPont Company plants for the production of other materials deemed critical to the successful prosecution of the war. Sub-series D contains the files of Erling Bertrand, an engineer with the Calco Chemical Division of the American Cyanamid Company. These files include reports, memoranda, and blueprints related to the design and construction of an ammonia evaporator for a proposed nitric acid plant. Sub-series E contains the systems development files. These files include studies regarding the development of a comprehensive project scheduling system and the use of data processing equipment to develop more efficient production methods.