Metamorphic map of Europe 1:2.500.000. - Bard, J. P.; Helmers, H.; Carvalhosa, A.; Choubert, Georges, 1908-1986; Faure-Muret, Anne, 1917-2003; Saggerson, E. P. (The Subcommission for the cartography of the metamorphic belts of the world, 1973)