The phrase "a copious source of" is correct and usable in written English.
It can be used to describe something that provides a large amount of information, resources, or material on a particular subject.
Example: "The library is a copious source of knowledge for students and researchers alike."
Alternatives: "an abundant source of" or "a rich source of".
This type of particle accelerator was a copious source of neutrons, which had recently been discovered by Sir James Chadwick in England.
This approach demonstrates that ant venom is a copious source of new compounds.
Fusion fission hybrids, driven by a copious source of fusion neutrons can open qualitatively "new" cycles for transmuting nuclear fertile material into fissile fuel.
During a pseudospark discharge, a low-temperature plasma is formed which acts as a copious source of electrons and can be regarded as a low work function surface that facilitates electron extraction.
It seems that Adrastea is the most copious source of this ring material, as evidenced by the densest ring (the Main Ring) being located at and within Adrastea's orbit.
They form downwind of copious sources of dry, loose sand and occur when topographic and climatic conditions cause airborne particles to settle.
If human oocytes could be generated in the same way from human embryonic stem cells, researchers would have a copious new source of oocytes, which are now obtained from patients through an uncomfortable procedure requiring strong drugs and surgery.
"Think about what a vintage brings to the equation," says Steve Burgess, whose family's winery, Burgess Cellars in the Napa Valley, is perhaps the most copious retail source of great old wine in the United States.
If it were only that, it would be, at best, candy; instead, it's a treasure, both as a portrait of the artist and as a copious record of his ideas — it is, in fact, a key source for understanding Welles, the director and the man.
Female friendship, Coodley adds, played a central role in Sinclair's life, and she demonstrates this by drawing upon copious sources.
It really was a copious amount of sunflowers.
