Caspar David Friedrich, 1774-1840: romantic landscape painting in Dresden: [catalogue of an exhibition held at the Tate Gallery, London, 6 September-16 October, 1972

"Works of the German romantic painter who is best known for his later allegorical landscapes, which feature contemplative figures silhouetted against night skies, morning mists, barren trees, and Gothic ruins."--caspardavidfriedrich.org.