The phrase "a rich source of both" is correct and usable in written English.
It can be used when referring to something that provides a substantial amount of two different types of information, resources, or benefits.
Example: "The library is a rich source of both historical documents and contemporary research materials."
Alternatives: "a valuable source of both" or "an abundant source of both".
A gas boom has brought companies and workers into parts of Pennsylvania that lie atop the Marcellus Shale formation, a rich source of both natural gas and controversy.
Dr. Fenn, Professor Emeritus of Chemical Engineering, knew that his "deliberate leaks" would long continue to be a rich source of both basic information and solutions to practical problems.
Crude extracts of Drosophila embryos are a rich source of both DNA topoisomerase I and chromatin assembly activity [Nelson, T., Hsieh, T., & Brutlag, D.L. (1979) Proc. Natl. Acad. Sci. U.S.A. 76, 5510-5514; Hseih, T., & Brutlag, D. L. (1980) Cell (Cambridge, Mass). 21, 115-125].
Human umbilical cord blood is a rich source of both hematopoietic stem cells and MSCs [18], [19].
While not an obvious method for collecting information on adherence or sensitive behaviour, and not generally used in microbicide research, ethnography (including informal observation and conversation) can be a rich source of both direct and indirect data.
DPP10789 protein levels were analyzed in the hippocampus as it is a rich source of both NFTs and NPs.
New technologies - particularly the internet and mobile phones - provide a rich source of ways both to disseminate health information and to collect data quickly and easily, from all parts of the world with mobile coverage.
The morphology of the elbow in bats has long been recognized as a rich source of information, both systematic [ 16, 23- 29] and functional [ 27, 28, 30- 33].
And the happy accident has certainly proved a rich source of material for both their careers: Brown's most recent stand-up show was inspired by his unexpected fatherhood, while Cave also made a solo show about how falling in love for the first time while preggers led to crazy jealous stalking of Brown's former girlfriends.
The theory of variational inequalities has become a rich source of inspiration in both mathematical and engineering sciences.
Further, a completely annotated Schistosoma mansoni genome should, in the future, provide a rich source of information for both academia and non-profit interests to identify, prioritize and prosecute drug and vaccine targets.
