History - Ego sum via
Feb 07, 2021 (xmarteo)
Removed AR1912 as a source because this is a Solesmes score. Will add the corresponding Vatican score.
sources
[{"chant_id":"4514","source":"9","page":"587","sequence":"0","extent":"0"},{"chant_id":"4514","source":"17","page":"268","sequence":"0","extent":"1"}]