[Heritage Day 2015 - "there is lots to do, yes?"].
D005858:Germany; D049672:History, 19th Century; D049673:History, 20th Century; D010825:Physics / Q000266:history*; D011859:Radiography / Q000266:history*; D012111:Residence Characteristics / Q000266:history*; D014965:X-Rays