The Bibliographic Database of German Publication on Russia, the Soviet Union and its Successor States (RussGus)

The Bibliographic Database of German Publication on Russia, the Soviet Union and its Successor States (RussGus) contains about 170.000 records from 1974 to 2003 and collects publications of different document types: books, dissertations and other university publications, articles from journals and newspapers including reviews, maps etc. The lists of personal and geographical subjects are located here and here.

Your search for Firsow, F. provides 12 hits
11	Stalin und Fragen der Einheitsfrontpolitik Firsow, Fridrich, in: Tödliche Umarmung. Einheitsfront - ein stalinistisches Manöver? Hrsg. von Viola Godemann, 1991, S. 27-46
12	Die Komintern und Stalin. Sowjetische Historiker zur Geschichte der Kommunistischen Internationale Berlin: Dietz 1990, 136 S.

The Bibliographic Database of German Publication on Russia, the Soviet Union and its Successor States (RussGus)

Stalin und Fragen der Einheitsfrontpolitik

Die Komintern und Stalin. Sowjetische Historiker zur Geschichte der Kommunistischen Internationale