Autograph Inscription Signed, "To Oscar & Natalie / from / Maria Callas / 1974," on a page excised from a concert program for a performance of arias, songs, and duets, with Giuseppe di Stefano on April 9, 1974. Additionally signed by Di Stefano, below Callas's inscription. 8vo; inscribed over the printed text, some toning at edges. [Brookville, NY], 1974. Together with an original 7 x 8 inch Christian Steiner photograph of the two singers, stamped by the photographer on the verso and in fine condition.