These vector maps represents the sanitary districts established by the French Municipal Council in the French Concession. These sanitary districts were designed to survey medical and sanitary issues in the settlement and to organize sanitary easures in times of emergency (war) or epidemics.

The full metadata, as well as jpeg images of the maps can be found in the Base Maps section of Maps Sources under ID 441 (1920), ID 442 (1935) and ID XXX (1940).