21. IOR/V/27/624/21 Reference (shelfmark): IOR/V/27/624/21 Title: Singh, Puram, Report on the preparation of mangrove tannin extract. Calcutta, 1912 Collection Area: India Office Records and Private Papers Languages: English Date Range: 1912 Extent: 1 volume
22. IOR/V/27/624/22 Reference (shelfmark): IOR/V/27/624/22 Title: Pilgrim, J Aldred, Indian tanstuffs. Calcutta, 1920 Collection Area: India Office Records and Private Papers Languages: English Date Range: 1920 Extent: 1 volume
23. IOR/V/27/624/23 Reference (shelfmark): IOR/V/27/624/23 Title: Pilgrim, J Aldred, Tanstuffs of the Sundarbans Forest Division. Calcutta, 1920 Collection Area: India Office Records and Private Papers Languages: English Date Range: 1920 Extent: 1 volume
24. IOR/V/27/624/24 Reference (shelfmark): IOR/V/27/624/24 Title: Chatterton, Alfred, Note on chrome tanning in Madras. Madras, 1906 Collection Area: India Office Records and Private Papers Languages: English Date Range: 1906 Extent: 1 volume