ViFaOst: Reference works

General german biography & New german biography (ADB & NDB): Digital index with entries relevant also for Eastern European Studies
Altrichter: The Soviet Union. From the October Revolution until Stalin's death: Online version of Helmut Altrichter's monography (in German)
Baltische biographische Lexika: Digitized biographic reference books
Clio Online-Guide Osteuropa: Überblick über Online-Ressourcen zur Osteuropäischen Geschichte
Dates in Russian history: Data base with search possibilities for a date, a time period or an era