History - Confitebuntur
Sep 25, 2019 (nokel81)
Added Liber Usualis as source
sources
[{"chant_id":"762","source":"2","page":"[16]","sequence":"1","extent":"1"},{"chant_id":"762","source":"3","page":"1147","sequence":"1","extent":"1"},{"chant_id":"762","source":"3","page":"1465B","sequence":"1","extent":"2"}]