http://www.lib.utexas.edu/maps/historical/shanghai_1907.jpg
Map is from the collection at U of Texas. I emailed them to ask about this:

" I would like to use one of your historical maps http://www.lib.utexas.edu/maps/historical/shanghai_1907.jpg in the Wikivoyage (Wikivoyage.org) article on Shanghai. They require that anything uploaded be released under their Creative Commons 3.0 license. I have read your usage statement and it appears to me that this map is in the public domain so I can do that. However, I thought I'd better check.

Their reply:

" Thank you for your interest in the University of Texas Libraries' Map Collection. Unless marked otherwise, the maps scanned by the University Libraries are in the public domain. The map images are not copyrighted and no permission is needed to copy them. You may download them and use them as you wish. We do appreciate hearing from you about your use of these materials and we also appreciate you giving this site credit. Appropriate credit for public domain materials would be: "Courtesy of the University Libraries, The University of Texas at Austin."