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The European Bibliography of Slavic and East European Studies (EBSEES) - 1991-2007

The European Bibliography of Slavic and East European Studies (EBSEES) collects books, journal articles, reviews and dissertations from Eastern Europe (former countries of Eastern Bloc) which were published in Belgium, Germany, Finland, France, Great Britain, the Netherlands, Austria and Switzerland from 1991 to 2007. The segment "Literature" and "Culture" of the European Bibliography of Slavic and East European Studies contains 18.000 bibliographic entries (from the total asset of 85.000). More information can be found here.

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Your search for Pius XI, pope provides 2 hits
1

Nazisme et communisme: deux encycliques de mars 1937

Pie XI, Paris, Desclée De Brouwer, 1991, 208 p
2

Achilles Ratti (1918-1921)

Fribourg etc., Friburgus Helvetiae etc. (Acta Nuntiaturae Polonae, 57), 1995