1. IOR/W/L/PS/21/N4/18N Reference (shelfmark): IOR/W/L/PS/21/N4/18N Title: Sheet 18N [BASIDU Preliminary Edition] 1912. Scope & Content: Registered 1911. Reg.No.2108. D 11 (N.C.) 500. Collection Area: Map Collections Languages: English Date Range: 1912 Extent: Two copies