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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in scheme | commodity code | |||||||||
is primary topic of | asphalt |