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LIBER USUALIS. PLEASE NOTE!!! If you would like to download the Liber Usualis in PDF, please klick on "SAVE" and then "download document", NOT "Download PDF" !! I have checked : it works!More
LIBER USUALIS.

PLEASE NOTE!!! If you would like to download the Liber Usualis in PDF, please klick on "SAVE" and then "download document", NOT "Download PDF" !! I have checked : it works!
Public domain