"proven source" is a correct and usable phrase in written English.
You can use it when referring to a reliable or trustworthy source of information. For example, "We used a proven source to verify the facts in our research paper."
The terrestrial coastal plain part of the succession also contains coal-rich proven source rocks.
For example, Mr. Scher said, the most basic thing a buyer needs to know is whether there is a proven source of water on the property.
The "something else" was to wind down the print edition and invent a new business with a proven source of revenue: lists.
Wind turbines are a proven source of clean energy with wind power energy harvesting technologies supplying about 3% of global electricity consumption.
The commissioning of NGFF in 1961 for producing urea, a proven source of nitrogen nutrient especially for rice, marked the beginning of the green revolution in Bangladesh.
Even though more than 40 percent of American deaths now involve hospice care, many families still are trying to shoulder the burden on their own rather than turning to a proven source of help and knowledge.
Firms must be forced to take down harmful content, including proven sources of disinformation, the committee added.
Suspected or microbiologically proven sources of sepsis were recorded.
2. Proven Sources: Fiske, Princeton Review, Zinch – There are literally thousands of independent college-information books and websites.
And here we have a known, proven energy source that requires exactly zero emissions.
The NFL has proven a source of stability in an increasingly fragmented television market.
