[Ger-Poland-Volhynia] Siberian information

[rhloeb4 at mymts.net]

My grandmother, Alwine Klaprat, was exiled to Siberia in 1916. My grandfather, Wilhelm Endler, had voluntarily moved to Siberia sometime earlier. Their marriage was arranged/negotiated in 1920. They were married in Omsk. Does anyone know how to find information about events that took place at the turn of the century in Siberia?
Randy Loeb