The phrase "are largely undocumented" is correct and usable in written English.
It can be used to describe something that has not been recorded or documented in detail, often referring to data, events, or practices.
Example: "Many traditional practices in the region are largely undocumented, making it difficult for researchers to study their origins."
Alternatives: "mostly unrecorded" or "primarily not documented".
The factors influencing the emissions of individuals are largely undocumented, but they are assumed to be the same for all, be they low or high emitters.
or hardware ("brick") based are made are largely undocumented, not reproducible and an art form.
The prevalence and the patterns of ocular inflammatory disease and ocular tuberculosis (TB) are largely undocumented among Multidrug Resistant TB (MDR-TB) patients co-infected with Human Immunodeficiency Virus (HIV) and on antituberculosis and antiretroviral therapy (ART).
However, its use is largely undocumented in the literature.
These hidden debts encompass domestic public debts (which prior to our data were largely undocumented).
This was a response to the increasing levels of freshwater abstraction around internationally protected estuaries in the UK, as its relevance to waterbirds was largely undocumented.
The variability of expert opinion partly reflects the fact that the magnitude of the error that occurs when estimating p in fMRI data is largely undocumented.
If life on Earth is four billion years old, the geologist J. William Schopf wrote in his 2001 book, "Cradle of Life," four-fifths of it is largely undocumented.
Bring in a new market!" Undocumented millions Interestingly, there is a massive MMO market that's largely undocumented by the mainstream press - browser-based online worlds such as Dofus, MapleStory, and RuneScape all have playerbases that number in the millions.
Postpartum psychosis destroys women's lives and tears apart families; post-abortion psychosis is largely undocumented.
But due to its brief four-year tenure as London's resident countercultural grassroots movement, the movement was largely undocumented.
