1. IOR/W/L/PS/21/N4/23K 1917 Reference (shelfmark): IOR/W/L/PS/21/N4/23K 1917 Title: Sheet 23K [CHAHAK First Edition] 1917. Scope & Content: Registered 1916. Reg.No.3450. D 16 (D.O.6). 500.Two copies, stamped 'Specimen Map'. Collection Area: Map Collections Languages: English Date Range: 1917 Extent: Two copies, stamped 'Specimen Map'