Here is a nice Metropolitan Opera program cast sheet from January 27, 1973 signed by sopranos Gilda Cruz Romo and Gail Robinson. The performance that night was of Giuseppe Verdi's Un Ballo in Maschera. Cruz Romo sang the part of Amelia, and Robinson was the night's Oscar. The sheet is in great condition, with slight discoloration. It is approx. 8 x 11 in. in size. Sherrill Milnes, Richard Tucker, and James Morris were also in the cast. (You can see the opposite side of the page through the cast sheet on the scan; it is not stained.)