Topographic Maps of Eastern Europe: An Atlas of the Shtetl: http://easteurotopo.org/
This website, which was created by and is maintained by Hap Ponedel, includes maps from the late 18th Century though the 20th Century; articles about shtetls, migration, and regional history; and links to many research resources.
Maps of Areas in the Commonwealth of Poland-Lithuania, www.Lithuanianmaps.com
This website, which was created by and is maintained by Andrius Kapočiūnas (Andrew Kapochunas). It contains historical regional, national, and town maps of areas that were in the Commonwealth of Poland-Lithuania.
U.S. Army Topographical Maps, Series 501, U.S. Army Map Service, posted by the University of Texas Libraries:
NN34-3 (based upon 1939 and Soviet borders) – Šiauliai-Jurbarkas-Kelme-Raseiniai
NN34-6 (based upon 1939 borders) – Kaunas-Suvalki-Druskininkai
NN35-1 (based upon 1939 borders) – Jonava-Panevėžys-Rokiškis-Ukmergė-Utena-Linkmenys
NN35-2 (based upon 1939 and Soviet borders) – Dvinsk (Daugavpils)- Zarasai-Švenčionys
NN35-4 (based upon 1939 and Soviet borders) – Alytus-Vilnius-Eišiškis-Ašmiany