1. IOR/V/27/623/6 Reference (shelfmark): IOR/V/27/623/6 Title: J E De Vrij, On the cultivation of quinine in Java and British India (London, 1865) Collection Area: India Office Records and Private Papers Languages: English Date Range: 1865 Extent: 1 volume
2. IOR/V/27/623/21 Reference (shelfmark): IOR/V/27/623/21 Title: Jungbuhn, F and De Vrij, J E, An account of the quinquina plantations in the island of Java; translated from the Dutch by W T Fraser. Madras, 1861 Collection Area: India Office Records and Private Papers Languages: English Date Range: 1861 Extent: 1 volume