The Zarzuela Collection at Columbia University consists of almost five hundred different zarzuelas. Both nineteenth and twentieth century works are represented by libretti, scores, and separate instrumental parts. Formats include printed, typewritten, and handwritten items. Many of the libretti contain role assignments and other handwritten notes which indicate they were used by a traveling zarzuela company. Among the authors of the libretti are Javer de Bergos y Sarragoiti, Jose Estremero y Cuenca, Jacinto Benavente, and the Quintero brothers.