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* * 1925 Commune Sanctorum Gradualis Romani by F.X. Mathias (PDF)
Dr. Franz Xaver Mathias (an Alsatian priest) was organist at Strasburg Cathedral, where he founded in 1913 the “Saint Leo Institute for Church Music.”
Title: ORGANUM COMITANS ad COMMUNE SANCTORUM GRADUALIS ROMANI quod JUXTA EDITIONEM VATICANAM Harmonice Ornavit (Dr.) Father Franci Xaver Mathias, Regens Seminarii et Professor Musicae Sacrae in Academia Wilhelma Argentinensi (Pustet, 1925)