The collection of posters in the Polish Museum of America is most interesting due to its variety. The oldest posters date back to World War I. Many of them were designed by Władysław T. Benda and printed in the United States in conjunction with the campaign undertaken by Ignacy Jan Paderewski on behalf of Poland and the Poles in America. A significant part of the collection comes from the period between the wars, covering the entire range: informational, propaganda, and commercial; and all of the mediums of the artists: fine arts, architecture, and photography. The Museum has preserved a poster collection of historical value from World War II, issued by the Bureau of Propaganda and Information of the government-in-exile in London, and by other Polish organizations active abroad. The largest part of the collection is the post-war Polish Poster, generally recognized and highly prized, created by Tadeusz Gronowski and Tadeusz Trepkowski, and also by Roman Cieślewicz, Janusz Grabiański, Jan Lenica, Jan Młodożeniec, Franciszek Starowieyski, Waldemar Świerzy, and others.