The Corpus Reformatorum (Corp. Ref., Cor. Ref., C.R., CR) ( Halle (Saale), 1834 sqq.), is the general Latin title given to a large collection of Reformation writings. This collection, which runs to 101 volumes, contains reprints of the collected works of John Calvin, Philip Melanchthon, and Huldrych Zwingli, three of the leading Protestant reformers. Texts in the CR are written in either Latin, French or German (using Fraktur typefaces).
A collection of sixteenth century Catholic writings, intended as a counterpart to the Corpus Reformatorum, was begun by Professor Joseph Greving (1868–1919) of the University of Bonn in 1915. It was announced that same year in the Theologische Revue as a "Plan für ein Corpus Catholicorum" or "Plan for a Corpus Catholicorum" [1]