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 - UNESCO. German commission; Albers, Gerd, 1919-2015; Cramer, Johannes, 1950-; Dyroff, Hans-Dieter (Bonn : UNESCO. German commission, 1980)