A page from the manuscript score by Robles:
http://www.geocities.com/e_pomareda/alomia.html

I have been trying to locate the zarzuela, "El Condor pasa," text Baudouin y Paz and music by Robles; I don't know if lyrics were used in the performance. Some articles indicate a complete copy may mot exist.
Partitura para piano by Robles of "El Cóndor pasa" available from Musica Peruana upon receipt of a donation-
http://www.musicaperuana.com/pdf_files/partituras-piano.pdf

At musica peruana, another composition based on Andean music, by Celso Garrido Lecca, "Kuntur Wachana," "Donde Nacen los Cóndores," may be heard in a 2-minute midi-
http://www.musicaperuana.com/english/song.htm