The Pitch Lake is the largest natural deposit of asphalt in the ...
Scientists are planning an oily bitumen spill in this Ontario lake ...
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Pitch Lake - Wikipedia
A man's hand stirring liquid asphalt with a wooden stick at Pitch ...
File:Guide-demonstrates-the-'mother'-of-the-Tar-Lake-Trinidad.jpg ...
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The Pitch Lake is the largest natural deposit of asphalt in the ...
Asphalt - Pavement Interactive
