The area is known to be a source of oil.

Arab countries are among the most important sources of oil.

They want to control the sources of oil and gas in a vital area.

The formation is a rich source of oil, first discovered in the 1950s.

"I help the government develop sources of oil," Harry said.

Through the ages, the seeds have been a source of food and oil.

Yet they are also finding it hard to discover new sources of oil.

The nuts are also a good source of cooking oil.

It is also a source of cooking oil and ground flour.

It would also reduce our dependence on foreign sources of oil.