- typescript - J.H. Hutton tour diary in the Naga Hills
- manuscript - H.H. Godwin-Austen, Journal of a Tour in Assam, 26th November 1872 to 15th April 1873
- manuscript - H.H. Godwin-Austen, Journal of a Tour in Assam, 26th November 1872 to 15th April 1873
- published - Chapter III 'Detailed Report on the Naga Hills Expedition of 1878-80', Capt. P.J. Maitland