The most important databases:
European Bibliography of Slavic and East European Studies
OLC Slavic Studies – Online Contents
Olbislav – The Online Library of German-language Slavic Studies
General Regionally Annotated Corpus of Ukrainian Language (GRAC)
Narodowy Korpus Języka Polskiego (PAN)
Nacional‘nyj Korpus Russkogo Jazyka (RAN)
Corpus of Spoken Rusyn (Uni Freiburg)
Oldenburger Korpus zur weißrussisch-russischen gemischten Rede
Annotated Corpus of Pre-Standardized Balkan Slavic Literature
Literature on history and regional studies can be found in the subject of Eastern European History.