Fr. Narcisco Duran was Father-President of the California Missions several times and was known for his work as a choir director. For many years Duran taught instrumental and vocal music to local native peoples of San Jose and Santa Barbara Missions. His choirbook was constructed from an 1779 atlas. Pages of the atlas were folded and adhereed together to create blank pages for Duran to record pieces on. Some of these pages have come apart and will be left apart during conservation to maintain the full history of the object, however, other pages will need to be reattached to prevent future tearing. The choirbook needs an overall surface cleaning, several tears need to be addressed, and weakened corners need to be reinforced. The music was written with Iron Gall Ink which over time has begun to erode through the pages. With conservation we hope to stabilize the ink.