Hi from Paris,
Hello Ellen, hello Krzysztof,
You can get a much easier access with our alphabet to same Polish index by using this link to one of Stephen Morse's portal, thanks to his work :
I use it often and always find our Polish jewish parents who escaped to East into Russia after Poland invasion by 3rd Reich and Soviet Union in September 1939.
Ca. 250.000 fled in 1939, ca. 150.000 returned after 1945.
A lot of men had been enroled in Red Army and died (KIA, MIA), a lot of persons died from same starvation and diseases as russian people living there.
Archives and history of Medem Center (Bund / Workmen Circle) of France
Searching : FLAM, AGID, STOLTZ around Lemberg / Lwow / Lviv
ZYSMAN, KRONENBERG, ROTTERSMAN around Lodz