Dear colleagues, I would like to underline, that in general "historical importance" is independent from the physical existence of on "object". History is not strictly "visible"! Of course, geological and archaeological (= physical) aspects are important (as many others), but what about the mostly non-visible aspects of social and other parts of history!? Best regards Dr. Wolfgang Ebert *********************************************************** The German Society for Industrial Archaeology Emscherstrasse 71 D-47137 Duisburg Fon: +49-203-426482 Fax: +49-203-426481 Mobile Phone: +49-172-4612015 Internet: www.industriekultur.de eMail: mailto:[log in to unmask] **************************************************************