Warsaw directories viewable online, but which I cannot make searchable for technical reasons (e.g., low resolution images):
http://www.polona.pl/dlibra/docmetadata?id=7409 (1920)
http://www.polona.pl/dlibra/docmetadata?id=6322 (1832)
[1893 directory removed from this list now searchable as {d484} on GenealogyIndexer.org.]
-Logan