Telhados contemporaneos na arquitectura Portuguesa = Contemporary tiled roofs in Portuguese architectureRoof tiles : 2600 years of terracotta or ceramic roof tileSomething about roof tilesGebr. Laumans, clay goods factories Tegelen-L : catalogVentilation of tiled roofCosts of tiled roofs : a study conducted by the Ratiobouw Foundation on behalf of the Association of Roof Tile Manufacturers NEDACO