Author or ISBN please. My library shows nothing on the generic title - just air/sea disasters.
looks like someone gave you the info, but here’s some additional:
Ancient Global Dimming Linked to Volcanic Eruption (The Dark Ages)
http://www.freerepublic.com/focus/news/1988391/posts
The Dark Ages: Were They Darker Than We Imagined?
http://www.freerepublic.com/focus/news/925578/posts
Persian Coins From Sassanid Era (224-640AD) Discovered In Sweden
http://www.freerepublic.com/focus/news/746713/posts
Did Asteroids And Comets Turn The Tides Of Civilization?
http://www.freerepublic.com/focus/chat/714636/posts