For most people, the major source of lead is from food.

The lake is major source of fish for the town's people.

Writing became his major source of income in the years to come.

After all the debate, is water a major source of lead in the environment?

Is it common sense to let just five companies own all the major sources of information and news in America?

Today the book is a major and unique source of information.

After all, she'd just lost a major source of income.

A major source of difference between these groups is their approach to Jewish law.

And until recently, the bank was a major source of campaign funds.

It is a major source of gold for both China and the global market.