A steady and substantial source of funds was necessary for success.

During this period, Kiss merchandise became a substantial source of income for the group.

Although union officials are involved in a new fund-raising campaign, no substantial sources of funds have turned up.

Having a web page where people can offer funds to a candidate has become a substantial source of money for most candidates.

As a result, the logging industry is a substantial source of revenue.

This could not be described as a substantial source of income.

The most substantial source available is al-Maqrizi writing six decades later.

In the adult female the ovary is a substantial source of 20-hydroxyecdysone production.

Big business has become another substantial source of revenue.

It continues to serve as a substantial source of information on the composer's life.