'wherein they' is a correct and usable phrase in written English.
You can use it when referring to a place or situation to which someone has previously been referred. For example: "The town, wherein they had lived for many years, was now unrecognizable."
Tells about their second urban canoe trip, wherein they circumnavigate Manhattan.
For the past three years, the company has published a "Life at Home" report, wherein they survey up to 12,000 people in 12 cities.
But, unlike domesticated animals, octopuses don't have what Pollan calls a "bargain with humanity," wherein they are dependent on us rearing them as either food or pets.
Many patients undergo a psychospiritual epiphany, wherein they feel a union with the Universe and sense life has meaning beyond what's happening in the physical body.
They are found in alkalic rocks such as nepheline syenites and phonolites, wherein they are associated with orthoclase, feldspathoids, augite, and sodium-rich amphiboles.
All persons born or naturalized in the United States, and subject to the jurisdiction thereof, are citizens of the United States and of the state wherein they reside.
The parameters are listed in Table 3 along with the range wherein they are varied.
The methods involved a pretest-posttest experimental design in which students were randomly assigned to either the experimental group, wherein they participated in the intervention, or the control group, wherein they attended classes without any auxiliary interactions.
Most hosts and parasites exist in diverse communities wherein they interact with other species, spanning the parasite mutualist continuum.
Facing conditions of perpetual escalation, miners join pools, wherein they aggregate computational resources and share the rewards.
Briefly, metals are easily accumulated in soils, wherein they may persist over long periods of time [3].
