Topographical sketch map of Borneo. Scale 1:3,500,000 ... / 
Smythies, Bertram E.(Bertram Evelyn)
Kuching.Geological Dept.
[Edinburgh :  Oliver & Boyd, 
1968]
In: The Birds of Borneo. By Bertram E. Smythies.
Inset: [Situation of Borneo in South-East Asia]