Useful tools
Among the useful features on the site of Société d’Histoire des Français de Chine are these detailed maps of the International Settlement and the French Concession (1939; 1946), as well as the 1946 map of Shanghai’s old city, originally released by Christian Henriot of Virtual Shanghai. They are easily scalable and moveable.
Another nice integration is this searchable database derived from the Hong Lists and digitized by Virtual Shanghai:
Example of a search for the name of the architect Alexander Yaron.