"extent from which" is correct and usable in written English.
It is generally used in the context of describing the degree or range of something. For example, "The extent from which his influence has reached is quite remarkable."
It would service -- and gradually pay down -- the legacy debt with revenue stemming to a large extent from families which have benefited most from the sacrifices which the Greatest Generation undertook to make America a global economic superpower.
Our next aim was to investigate the chromosomal regions proximal to vertebrate myod genes using a comparative-genomic and phylogenetic approach to confidently establish the extent of the duplication event from which Acanthopterygian MyoD1 and MyoD2 paralogues arose.
The first is a geospatial characterization of all lakes within the study extent from ~1980 to 2011, which we refer to as the census lakes (LAGOSGEO).
PCA showed that the mineralization was related mainly to orthophosphate content and to some extent to ammonium, calcium from which increasing conductivity.
The method is based upon measuring the extent of the land from which different land cover types may be visible, on a cell-by-cell basis, using high resolution Digital Elevation Models combined with interpreted land cover data as inputs.
In high income countries the nursing workforce is ageing [ 9] and to a greater extent than the populations from which they are drawn [ 10, 11].
That's what researchers will report in an upcoming issue of The Astronomical Journal about the extent of dust and gas from which our planetary system first formed.
The shape of the resulting queuing region determines the maximum queue size (in vehicles) and extent (in distance), as shown, from which the total delay can be determined by geometry taking account of traffic density and speed.
"Aron is currently undergoing a series of tests and investigations to determine the extent of his shoulder injury, from which we will be able to implement a management and recovery schedule".
The χ parameter is then used to determine the coexistence curves as a function of conversion of the DGEBA/DETDA pseudo-component, from which the extent of reaction at which vitrification occurs is predicted.
