1. IOR/X/14053/72O Reference (shelfmark): IOR/X/14053/72O Title: Sheet 72O Purnea First Edition 1939, reprinted 1942. Sheet G-45P. Surveyed 1936-37. Registered 1937. Previous provisional issues 1912, 1928, Preliminary edition 1938. Heliozincographed SIO Calcutta. Reg.No.1728. D'37 (D.O.5–3/8") 10,500'42. Grid II B (Yards) overprint. Collection Area: Map Collections Languages: English Date Range: 1942 Extent: Three copies.