Geographical Dictionary of 19th Century Poland

The “Slownik geograficzny Krolestwa Polskiego” gives a historical and physical description of almost all cities, towns, villages and hamlets in Poland and nearby Slavic countries along with mention of historically important events, buildings such as churches and personages.
Most important is the fact that the descriptions are circa 1880 to 1902, or about the time when most Poles were starting to leave Poland.
The Polish Genealogical Society of America offers a CD-ROM-edition. The dictionary is also available in archives and libraries.