Subsequently the title changed to Colony and Protectorate of Kenya Blue Book and then, from the 1931 edition, to Kenya Colony and Protectorate Blue Book Digitised by Google Books from the collection at Stanford University https://books.google.com/books?id=4iQ4AQAAMAAJBlue Books were prepared regularly, generally each year, by Colonial Governments and sent to the Colonial Office, part of the British Government, in London. Original Blue Books may be found in the collection of the National Archives, Kew, England in the Colonial Office CO records, generally classified as  Miscellanea, see  https://discovery.nationalarchives.gov.uk/browse/r/h/C437  “Division within CO”.