Cummian's letter De controversia Paschali /
Cummian,Saint.
Walsh, Maura,1952-
Ó Cróinín, Dáibhí.
Pontifical Institute of Mediaeval Studies.
Toronto : Pontifical Institute of Mediaeval Studies,
c1988.
Includes index.
Text in English and Latin.
Bibliography: p. [230]-243.
Easter.
Church calendar