Title | Date | Subject | Description | ||
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1 | Utah tar sands | 1984 | Utah tar sands; survey notes; asphalt; bitumen; tar; land slides; snow slides; petroleum; tar sand resource | The words, tar, asphalt, bitumen, pitch, and heavy oil often have been used to refer to highly viscous liquid, semi-solid, or solid, naturally occurring hydrocarbon substances. The word bitumen originated with the Romans and included all the various types of natural hydrocarbons. In its modern, comm... |