Does anyone have a good source (especially online) for obtaining records from Ufa, Russia in the 1941-1949 timeframe?

I'm looking for information on siblings of my great-grandmother Gussie Squire/Scvirsci, born Gitel Gorovitz. The two primary names I have connected to Ufa are Ida S. Lifshitz and Lisa Solomovna Horovitz. According to letters I have dated 1948-1949 they're from Lvov originally but fled to Ufa in 1941. Ida may have subsequently moved to Moscow to rejoin her children. 

Thanks,
Gary
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Gary Ehrlich
Rockville, MD
SCVIRSCI, Zhivotov, Ukraine; WASHLIKOVSKY/WASHALKOWSKY, SATER, Bialystock, Poland;
LIFSHITS/LIFSHITZ, GOROVITZ, HOROVITZ, Lvov, Ukraine; Ufa and Moscow, Russia
YAGUDA, Albany, NY