This series contains a vast array of correspondents from both the Royal Household and political and military notables of the period. Some of the key correspondents have been noted here, with additional information about the topics discussed, which are mainly related to the war effort and to politics. Many of the volumes have a brief contents page at the back. Most of the volumes contain copies of outgoing correspondence, although several have original incoming letters, inparticular from Maurice Hankey [Later Lord Hankey] and from the Royal household.