Professor K. G. Davies spent over a decade researching through Colonial Office records relating to North America, including Canada, from 1770 to 1783, consisting of 570 manuscript volumes and bundles of records, each of them averaging 200 folios in length. He gives here a summary of every document which has survived, whether originating in Whitehall or in the colonies, arranged in chronological sequence. There are seven volumes of these Calendars summarizing 27,410 items. Documents of outstanding interest are printed in extenso, and these appear in fourteen volumes of Transcripts. Broadly a document was chosen for transcription if it describes an important event, illuminates an issue of principle, reveals something which someone wishes to keep dark, is the work of a famous person, or opens a subject which in the editor's view has been underestimated or misunderstood. Each volume is prefaced by short introductory statements by the editor.