For anyone who uses historic aerial maps of Shanghai at Tianditu 天地图, the restriction on zooming in to the maximum level is irritating. So I uploaded the central part of the 1948 aerial map at the maximum resolution to the Internet Archive (30 Mb). It shows the Central French Concession and the south of the Internationall Settlement. The difference between zoom Level 7 available at Tianditu and zoom Level 9 is self-explanatory (see it larger).
I've broken down the entire map into 12 zones; the zones 1A, 1B and 2B are uploaded; more to come.