Map of Surabaya, Indonesia, from Guide to the Dutch East Indies by Dr. J.F. van Bemmelen and G.B. Hoover, Luzac & Co, London 1897. Courtesy of the Perry-Castañeda Library Map Collection, University of Texas at Austin.
Postpaarbank 1939, now changed into Bank Tabungan Negara (BTN)
1872 Map, Principal Dutch Colonies in the Indian Seas