PolishWEBSITES AND ARTICLES:
Institute of National Remembrance – Katyn: https://katyn.ipn.gov.pl/
Ministry of Culture and National Heritage – Katyn: https://katyn.miejscapamieci.gov.pl/
Records relating to the Katyn Forest Massacre: https://osrp-slask.policja.gov.pl/
National Archives in the USA – Katyń Files: https://www.archives.gov/research/foreign-policy/katyn-massacre
The history of Katyn Massacre: https://katynpromemoria.pl/
Katyn Museum: http://www.muzeumkatynskie.pl/
Federation of Katyn Families: https://www.federacja-katyn.org.pl/
Katyn Chapel – Mausoleum: https://katedrapolowa.pl/kaplica-katynska/
Jewish Historical Institute – Anniversary of the Katyn Massacre: https://www.jhi.pl/artykuly/zbrodnia-katynska-oficerowie-pochodzenia-zydowskiego,591
Virtual Shtetl – Polish-Jewish victims of Katyn: https://sztetl.org.pl/pl/aktualnosci/polscy-zydzi-ofiary-zbrodni-katynskiej
80th anniversary of the Katyn massacre: https://www.polin.pl/pl/rocznica-zbrodni-katynskiej
SOURCE MATERIALS AND LISTS OF VICTIMS:
Katyn decision of March 5, 1940: https://pl.wikisource.org/wiki/Decyzja_katy%C5%84ska_z_5_marca_1940
NKVD Letter № 00794/B: https://en.wikisource.org/wiki/NKVD_Letter_%E2%84%96_00794/B
National Archives in the USA – Katyń Files: https://www.archives.gov/files/research/foreign-policy/katyn-massacre/selected-records.pdf
Warsaw Ghetto Museum – List of Polish Jews murdered in Katyn: https://1943.pl/artykul/lista-zydow-zamordowanych-w-lesie-katynskim/
Rzeczpospolita – List of Polish Jews murdered in Katyn: https://www.rp.pl/historia/art8065681-katyn
Jewish community in Poznan – List of Polish Jews murdered in Katyn: http://poznan.jewish.org.pl/index.php/katyn-lista/