While in Heliligenkreuz, Janauschek composed his first major work,
Originum Cisterciensium Liber Primus (Vienna, 1877), in which he describes the foundation of the Cistercian Order, its organization and extension, and mentions many of those who, under various titles, had honoured it. He gives a lengthy account of 742 ancient abbeys of monks, founded between the end of the 11th and the end of the 17th centuries. The genealogical and chronological tables, as well as the work itself, required a colossal labour of research and compilation. He was unable to publish the second volume, which was to have been devoted to
Cistercian nunneries, and for which he had collected a great deal of material. He also published, at this period, a work of lesser importance on the history of the Cistercian Order. His second major work is
Bibliographia Bernardina. In 1891, on the occasion of the eighth centenary of the birth of
Saint Bernard of Clairvaux, the Cistercian Congregation of Austria prepared four volumes, under the title of
Xenia Bernardina. Janauschek gave assistance in the preparation of the first three volumes, but the fourth,
Bibliographia Bernardina (Vienna, 1891), was entirely his own work. He there discusses successively the different editions of the works of Saint Bernard and their translations, the essays on the life of the saint, various
panegyrics, his biographers, the inscriptions in his honour, the opinions of ecclesiastical historians, etc. The books noticed in
Xenia Bernardina amount to 2,761 printed works and 119 manuscripts. ==References==