'In "Description of the World", Polo notes the then-startling use of this as fuel; he called it "black stones"'
coal
MARCO POLO: In Description of the World, Polo notes the then-startling use of this as fuel; he called it black stones
In "Description of the World", Polo notes the then-startling use of this as fuel; he called it "black stones"
In "Description of the World", Polo notes the then-startling use of this as fuel; he called it "black stones"
MARCO POLO
coal
MARCO POLO