This collection contains all cablegrams exchanged between the two headquarters except the series listing names of casualties. The nine series are: From GHQ, AEF to the War Department-Main series; Confidential Cablegrams; Weekly, Semi-Weekly, and Daily Summaries; Summaries of Activities, U.S. Troups; American Official Communiques; Courier Cablegrams; and from the War Department to GHQ, AEF-Main Series; Confidential and Courier Cablegrams. They cover personnel, supply, U.S. and Allied Operations, assignments of units, inventories, health issues, and forwarding of Communications from the field to GHQ to the War Department. The series are arranged and numbered in chronological order; see the printed guide for further information.