POTHIER
1895 (revision of the Liber Gradualis) 
SCHWANN 1953 (edition
of the Vaticana with editorial signs affecting the morae)
MOCQUEREAU 1921
Liber Usualis (edition of the Vaticana with Mocquereau's rhythmic
signs) 
DR. X. MATHIAS 1911
(edition of the Vaticana in modern notation) 
NOVA ORGANI HARMONIA
(1940's organ accompaniment based on the Vaticana with some morae
marked) 