History - Dum sanctificatus
Feb 27, 2022 (fkchaud)
Adding Graduale Romanum 1974 as a source
sources
[{"chant_id":"418","source":"2","page":"145","sequence":"1","extent":"2"},{"chant_id":"418","source":"3","page":"859","sequence":"1","extent":"1"},{"chant_id":"418","source":"4","page":"249","sequence":"1","extent":"1"}]