Protection and Cultural Animation of Monuments, Sites and Historic Towns in Europe : the present situation in Belgium, Bulgaria, Canada, the Federal Republic of Germany, France, Greece, Hungary, Italy, the Netherlands, Poland, The United Kingdom and Yugoslavia - Dyroff, Hans-Dieter; Albers, Gerd; Cramer, Johannes; Gutschow, Niels (German Commission for UNESCO and the Academy of the Chamber of the Architects, Nord-Rhine Westphalia, 1980)