• 3 hand drawn maps & 1 printed map of an Expedition in Siam (1921), Chengmai district, N. Thailand, to be found in Archive Box I-K. 2 expeditions were taken during 1921. Routes followed day by day marked in red. Jan-April and late April –Jun. Printed map of the Kingdom of Siam and neighbouring states pre-1939
• Hand written list of plants extracted from a copy of J.G. Koenig's ‘Journal of a Voyage from India to Siam and Malacca in 1779’ (April 26th 1931), in folder in Archive Box I-K. Plants noted at Ban Pak nam, Siam. Some plants introduced since his visit.