2022-04-292022-04-291970https://hdl.handle.net/2152.3/11418One cut square featuring Wilhem Röntgen. Four 1901 Nobel Prize winners including Röntgen from Sweden. One Cuban stamp of Francisco Roldan. One stamp of Thomas Palamo from El Salvador.Six stamps and one cut square.Stamp collectingPostage-stamp albumsRöntgen, Wilhelm Conrad, 1845-1923SwedenDomínguez y Roldán, Francisco, 1864-1942X-rayPalamo, ThomasNobel Prize winners