Details from the documents: Fishing rights on the pearl banks, 1857, 1862.-- Remarks on the pearl oyster beds in the Persian Gulf, 1866.-- Measures to prevent pearl divers from abandoning their debts, 1868- 1886.-- Weights and measures employed in the pearl trade, 1886.-- The problem of piracy, 1876, 1887. -- Legal status of pearl banks, 1912.-- International commercial interests and competition in the Persian Gulf pearl trade, 1905-1918.-- Effect on pearl fisheries of concessions granted to Sponge Exploration Syndicate by Sultan of Muscat and Shah of Persia, 1906-1907.-- Use of apparatus and divers from Bombay, 1912.-- British naval patrols defend pearling fleets, 1909.-- Central role of pearl industry in Bahrain trade, 1909.-- Accounting system used by Nakhudas: accounts of 23 divers and pearlers, 1923 (in Arabic).-- The pearl market at Kuwait, 1918, 1924.-- The threat from cultured and artificial pearls, 1924, 1934.-- Report on diving conditions, 1930.-- Attempts to introduce deep sea diving suits, 1930.-- The pearl divers ́riots at Bahrain, 1932.-- Petitions from divers, certificates of manumission, 1928-1934.-- Naval patrols of the pearl banks, 1931-1932.-- Trial of merchants trading in cultured pearls, 1935.-- Divers ́work conditions at Kuwait, 1934.-- Pearling concessions from Saudi Arabia, 1934.-- Effect of pearl diving debts, 1935.-- The Trucial Shaikhs ́territorial rights over pearl banks, 1938.-- Indian embargo on pearl imports, 1947 * New marketing initiatives for Persian Gulf pearls.-- Economic significance of pearl trade, 1951.-- Adverse effect of middlemen for Bahrain pearl merchants, 1962.