Contraste   Creator:   Ayala, Ermelinda y su grupo ( performer ) Serrano, Angel ( composer ) Publisher.Display:   America Format:   1 sound disc : 78 rpm ; 10 in. Subjects.Display:   bolero Source Institution:   Florida International University Contraste	Una sombra más   Creator:   Ayala, Ermelinda y su grupo ( performer ) Hernández, Ada María ( composer ) Publisher.Display:   America Format:   1 sound disc : 78 rpm ; 10 in. Subjects.Display:   bolero-tango Source Institution:   Florida International University Una sombra más