found: Wagner, R. Lohengrin [SR] 1983:label (Helen Traubel) container (sings role of Elsa)
found: Baker, 8th ed.(Traubel, Helen (Francesca); b. June 20, 1899, St. Louis; d. July 28, 1972, Santa Monica, Calif.; American soprano)
found: The Metropolitan Opera murders, 2022:CIP title page (Helen Traubel) galley (introduction: Helen Traubel, the leading soprano at the Metropolitan Opera and one of the most famous women of the late 1940s to early 1950s, was a great fan of mystery fiction, but she was not the first opera star to write mystery fiction)
