This volume is based primarily upon available official public documents of the United States and Canada and upon the official files of the following U.S. Government agencies: the U.S. Section of the Permanent Joint Board on Defense, Canada-United States, the Department of State, the War Department, the Navy Department, and the Joint Chiefs of Staff. The public documents used in preparing the study are listed below under Published Works.
These papers were the most concentrated and fruitful source of material for this study. They include the official records of the Board itself, the extensive correspondence exchanged between the various members of the Canadian and U.S. Sections of the Board, and the similar but even more extensive correspondence between the members of the U.S. Section and agencies of the State, War, and Navy Departments.
In theory, the office of the U.S. secretary of the Board in the Department of State was the office of record for the U.S. Section. In fact, the office of the U.S. Army members of the Board was the repository of the most complete records on the subject of U.S.-Canadian wartime military co-operation. There appear to be two reasons for this. First, virtually all matters dealt with by the Board were also within the purview of the U.S. Army members, whereas many matters of narrower scope were worked out between the U.S. Army members and War Department agencies without reference to the secretary of the U.S. Section. Second, the U.S. Army members maintained a separate office of record, whereas the U.S. secretary did not keep distinctly separate records for Board matters. Instead, he incorporated Board papers with the files he maintained as the Canadian-desk officer or as officer in charge of Dominion affairs. In addition, the bulk of the World War II papers of the U.S. secretary has been retired to, and amalgamated with, the general Department of State records. Where the State Department records have been used, they are identified by a Department of State file reference. Permanent Joint Board papers are located in the files of the U.S. Army members of the Board and references thereto are identifiable by the file index PDB.