These written records are among the most extensive and important sources of available primary discographic information in the world.

The 352-page book contains 80 photographs, two maps and extensive sources.

It was also an extensive source of rice for the Việt Minh.

He has varied and extensive sources of income.

It is the only extensive and authoritative source for the history of Greek railways.

Hungary lacks extensive domestic sources of energy and raw materials needed for industrial development.

Even as a reporter, he said, he always had a reputation for having extensive sources.

Shenk et al. provide a substantial bibliography with extensive primary sources.

"We could not have communicated without such an extensive source of information."

Decentralised energy systems will need to be combined with extensive sources of renewable energy.