 The title "Foreign Relations of the United States" is commonly abbreviated as "FRUS" in citations and the volume number written as a Roman numeral.The series is categorized by year and region, such as 1936, Volume II, Europe.In a 2013 report on the status of the "Foreign Relations" series, Richard Immerman, Chairman of the Office of the Historian's Historical Advisory Council, stated that "Because the Foreign Relations series serves as the primary venue for publishing documentation on the role of intelligence activities in U.S. foreign relations, it has become renowned internationally for its openness.