by Ruth Leiserowitz
Valuable links for the Warsaw site.
# Data base for Jewish cemetries in Warsaw
https://cemetery.jewish.org.pl/list/c_1
# Numbers of house lots in Warsaw. Until the end of the 19th century, the number of the house lot was noted as the address on deeds. This number was not identical with the street number. The link leads to a number directory from 1852.
# This free genealogy search engine contains a lot of address books from the 19th and 20th century especially for Warsaw.
https://genealogyindexer.org/directories
Prof. Dr. Ruth Leiserowitz
Stellvertretende Direktorin
Deutsches Historisches Institut
Pałac Karnickich
Aleje Ujazdowskie 39
00-540 Warschau
Polen