Once known familiarly as PG 4, PG 13 and PG 53, these summaries of incoming reports to the British government were the indispensable companions of British Foreign Office specialists and diplomatic personnel concerned with Persian Gulf affairs. This series was originally intended to update Lorimer's Gazetteer, the later Historical Summaries provide records of events and political assessments of their significance. Here we present the series in four volumes with accompanying treaties, maps and ruling family trees, and including the early volume Memorandum respecting British interests in the Persian Gulf, 1908.