Library of Congress exhibition Woodcut in early printed books Library of Congress exhibition http://www.loc.gov/exhibits/heavenlycraft/heavenly-15th.html Woodcut in early printed books Woodcut in early printed books medieval scenes Woodcut in early printed books Woodcut in early printed books http://www.loc.gov/exhibits/heavenlycraft/heavenly-15th.html Woodcut in early printed books Woodcut in early printed books