Durch Zentral-Sumatra
http://hdl.handle.net/1887.1/item:1099228
von Alfred Maass.
Maass, Alfred.
N 95-556
Description and travel
Sumatra (Indonesia)
German
Germany
scans
1910-1912
http://hdl.handle.net/1887.1/item:1274493
KIT Royal Tropical Institute,