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Source/Further reading:
In Our Time BBC podcast: www.bbc.co.uk/...
Britannica: www.britannica...
Ancient History Encyclopedia: www.ancient.eu...
National Geographic on the Ming Wall: www.nationalge...
Smithsonian: www.smithsonia...
Timeline of the Great Wall: www.globalsecu...
Map of the Great Wall over various periods: upload.wikimed...
Warring States Period with map: www.ancient.eu...
Han Dynasty explained: www.history.co... #
Song Dynasty notes: www.khanacadem...
The Great Wall’s name: discover.china....
Protecting the Wall: www.theguardia...
The Wall as a nationalist icon: books.google.c...
Useful timeline on all of China’s dynasties (in order): www.historyhit...
State of preservation today: www.npr.org/se...