During World War I, the NID published dozens of “country studies” to acquaint planners with aspects of countries little-known or explored. In fact, some of the volumes, such as those on Saudi Arabia, were based on native sources (5). Each study contains information on geography, native plants, populations, languages, spelling, place-names, diseases, military forces, and importantly, routes through the country. These works were never intended for the general public so it is rare to find them. For a more inclusive look at the NID, please read this dissertation – Studies in British naval intelligence, 1880-1945.
Great Britain. Naval Intelligence Division. Handbooks