Double signed program for a concert of the Orquestra Sinfonica Nacional at the Teatro Nacional de San Carlos in Lisbon, Portugal on November 11, 1948 conducted by Dobrowen and featuring Boos as Violin soloist. Full 8 page program, signed by each artist inside program, next to their biography and underneath their publicity photo. Size of each page is 6.25 x 8.75 inches, in very good condition.