1. IOR/E/1/9 ff. 297-298v Reference (shelfmark): IOR/E/1/9 ff. 297-298v Title: Letter 168 Commissioners of the Ordnance Office to the Court enclosing Francis Grueber's affidavit concerning the refraction of saltpetre. Collection Area: India Office Records and Private Papers Languages: English Date Range: 30 Sep 1718 Extent: 1 letter