EditorialExtended tunnels_3, A naturally decaying rock cleft is extended and supported by narrow crossways and crevices created, woodcut, p. 51, (Liber tertius), Manuel, Hans Rudolf (graveur sur bois), 1556, Georgius Agricola: De re metallica libri XII: quibus ...
EditorialExtended dykes_2, A naturally decaying rock cleft is widened by artificially created crossways and crevices, woodcut, p. 45, (Liber tertius), Manuel, Hans Rudolf (graveur sur bois), 1556, Georgius Agricola: De re metallica libri XII: quibus officia, in...
EditorialThe Crossways House (La Maison en Croix), Jean-Charles Langlois (French, 1789 - 1870), 1855, Salted paper print, 26.2 x 31.9 cm (10 5/16 x 12 9/16 in.).