The phrase "a substantial field of" is correct and usable in written English.
It can be used when referring to a significant area of study, research, or expertise in a particular subject.
Example: "The university has developed a substantial field of research in renewable energy technologies."
Alternatives: "a significant area of" or "a considerable domain of".
Originally published in 1985, this was a foundational text in what is now the substantial field of developmental systems theory.
Thus, until the mid-1930s, while thinking about this new instrument of warfare proceeded, actual development of substantial field (as opposed to experimental) forces languished except among a few maverick officers.
Finally, as noted above under sub-regional and regional activities, the Inter-regional Programme will include a substantial number of field projects at the national level (Table 2a).
Because such bodies would have been relatively small, they would not have been able to retain primordial gases by means of a substantial gravitational field.
Umunna said the group hoped to field a "substantial number of MEP candidates with backgrounds from outside politics" if the UK takes part in the European elections.
However, this may require a substantial rebalancing of the field's incentives to reward actual research impact rather than sheer number of publications in major journals.
As a result of the greatly increased research activity in this field, a substantial amount of new data--especially related to materials--have been generated.
In 2009, Dean Simonton, a psychologist at the University of California at Davis and a co-editor of the 2014 book "The Social Science of Cinema," conducted a substantial reëxamination of the field, including Litman's work, and found that, while Litman's broad points held true, the formula got very messy very quickly.
TIG said it would field a substantial number of candidates if this happened.
