The phrase "ascertained supply" is correct and usable in written English.
It can be used in contexts related to confirming or determining the availability of a certain supply or resource.
Example: "After conducting a thorough analysis, we have established the ascertained supply of materials needed for the project."
Alternatives: "confirmed supply" or "determined supply".
As a second step, at the global level, overviews of existing literature reviews and systematic reviews were conducted in order to ascertain the supply of research, and analysis of regional and country reports was undertaken to identify research priorities that cut across multiple countries.
John Forbes Royle set out to compile his Manual of Materia Medica because the Medical Board wanted to ascertain whether supplies from Europe could be replaced by "articles indigenous in the country, or by cultivating exotics in the most suitable climates of the plains and mountains of North India".
Mortality was ascertained using databases supplied by the US army: the Veterans Administration (Beneficiary Identification and Records Locator Subsystem), the Social Security Administration, the Internal Revenue Service, and the National Center for Health Statistics Nationall Death Index).
Exposures to immunosuppressive agents were ascertained by the days' supply for all relevant medications.
Whereas Las Vegas long relied on groundwater resources up until 1971, then managed to remain within the small Colorado water allocation under the sharing agreements between riparian States, it seems SNWA authorities feel that despite their ongoing efforts, securing the city's water supply cannot be ascertained without water diversions.
The coal mines supplying coal were ascertained at interviews during household visits.
If the hypothesis is not accepted, the role of private standards as drivers of change in fruit and vegetable supply system is not ascertained and farm businesses' certification decisions are not in alignment with the demand.
Qualities/volume should be examined and ascertained in respect of capability to supply within the stipulated time.
Sources of alcohol supply in each village were ascertained during these interviews.
By evaluating the information needs of decision makers, or the "demand", along with the supply of information by the USDA, we can ascertain where matches between supply and demand exist, and where science policies might miss opportunities.
