Size of the database: 94,776 book articles, 14,8961 journal articles, 92,774 monographs and reviews, 1,420 processed periodicals Annual update of the database with approx. 16,000 titles The bibliography is "annotated", i.e. it contains notes including the following information: Notes identifying forewords and epilogues, appendices, bibliographic details, discussions etc. and authors covered, works, topics etc. Three language versions: German, English and French. The years 1956–1990 have been retro-digitised and are available as searchable PDF files (OCR).