Book has been extensively written in, spine has damage as pictured

Vocal score used by opera singer Gwen Curatilo, purchased from her estate sale.

https://today.csuchico.edu/gwen-curatilo-i-just-kept-singing/

In 1960, the San Francisco Opera hired Curatilo as a full-time member and her professional career blossomed as she sang throughout the US. Over the next six years, she sang in dozens of performances with the opera company, including Madame Butterfly, Marriage of Figaro, Carmen, and The Crucible. Curatilo received many cover roles—learning the scores of other singers so she could easily step in last-minute if needed.