Commodity Code
asphalt
http://resource.geosciml.org/classifier/cgi/commodity-code/asphalt
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| definition | Asphalt or bitumen is a sticky, black and highly viscous liquid or semi-solid form of petroleum. It may be found in natural deposits or may be a refined product |  |
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| source | http://en.wikipedia.org/wiki/Asphalt | |
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| is primary topic of | asphalt | |||||||||