|Wikipedia||Twierdza (województwo podkarpackie)||
|JewishGen Family Finder||Twierdza|
|Routes to Roots Foundation||Twierdza|
|IAJGS International Jewish Cemetery Project||TWIERDZA: Podkarpackie|
|Lo Tishkach||Twierdza Jewish Cemetery|
|Yad Vashem Shoah Names Database||Twierdza, Poland|
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