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Digital library of liturgical sources is a new research tool developed by the Research Group of Liturgical History. The Calendar-Project is a comprehensive database of almost 200 representative European liturgical Calendars and Sanctorals. Through browsing Saints and Feasts or Dates respectively, one can gain a statistically relevant sample of where, when and which feasts were celebrated within the medieval territory of the Roman Rite. Methodically, our research is based on the same principles as the whole of USUARIUM, namely that diverse sources based on their undoubted origin provide the best way to study the range of variability of liturgical Uses. Proofreading, corrections, new sources and facilities will follow in the coming weeks.