American cultural treasures: Hudson River School - block of four mint never hinged, USA

The US Post issued these four beautiful postage stamps that show a work by the founder of the Hudson River School - Thomas Cole - as well as pictures by Asher Brown Durand, Frederic E. Church and Thomas Moran. Block of four mint never hinged
Hudson River School describes a group of American landscape painters who were active in the mid-19th century. The subject of her pictures is the valley of the Hudson River, the Catskill Mountains, the Niagara Falls and many more.