The four $1 stamps are 2008 Stories and Songs issue illustrating Mail's Song,Big Brother,Scarecrow and Letters to Santa Claus.
The 50c stamp is from 2009 Unidad Postal series showing views of Iruya,which is a small town in northwestern Argentina. It is located in the Salta Province of northwestern Argentina, and is the capital of the Iruya Department. Located in the altiplano region along the Iruya river, Iruya sits nestled against the mountainside at an elevation of 2,780 meters . It is very remote, located over 300 kilometers from the province capital of Salta, and a 50-km portion of the route to Iruya is unpaved.Nonetheless, the town is popular with tourists for its scenic location and townscape and friendly locals.