Summary in spanish:
Lista de apellidos, apodos, nombres de pueblos y términos municipales obtenidos del "Libro Rubro" o libro de las cuentas del Monasterio de Irazu del siglo XII
Summary in english:
List of surnames, nicknames, names of villages and municipalities obtained from the "Libro Rubro" or book of accounts of the Monastery of Irazu in the 12th century