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Asphalt or or , also known as bitumen, is the sticky, black and highly viscous liquid or semi-solid present in most crude petroleums and in some natural deposits; it is a substance classed as a pitch. Until the 20th century, the term asphaltum was also used.
- Related: Blacktop, Tarmac, Bioasphalt, Asphaltene, Bitumen-based fuel, Bituminous coal, Bituminous rocks, Oil sands, Pitch (resin), Tar, Sealcoat, Stamped asphalt
Pavement Interactive - Asphalt
pavementinteractive.org/index.php?title=Asphalt - Web
www.asphaltmagazine.com - Web
CSU Sacramento, The World Famous Asphalt Museum!
ecs.csus.edu/~gordonvs/asphalt/asphalt.html - Web
Gallery for «Asphalt»
National Institute for Occupational Safety and Health - Asphalt Fumes
www.cdc.gov/niosh/topics/asphalt/ - Web