American cultural treasures: Hudson River School - 4 first day covers with color stamp, USA

With the series "American Cultural Treasures: Hudson River School", the US Post issued four beautiful postage stamps which, in addition to a work by the founder of the Hudson River School - Thomas Cole - also show pictures by Asher Brown Durand, Frederic E. Church and Thomas Moran. We can offer you these stamps on four first day covers, canceled with a color stamp.
Hudson River School is the name of a group of American landscape painters who worked 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.