The phrase "a key document" is correct and usable in written English.
It can be used to refer to an important or essential document that plays a significant role in a particular context or situation.
Example: "The report serves as a key document for understanding the project's objectives and outcomes."
Alternatives: "an essential document" or "a crucial document."
A key document describing who approved the switch is mostly blank.
The poet's reply, which is included in the Library of America volume, has become a key document of poetic modernism.
The second record remains a key document in the history of street rap, honoring Jay-Z's upbringing in the Marcy projects.
Whatever critics may make of it when it's published next month, it may be a key document for historians seeking to understand the ethos of the incoherent 90's.
Benjamin Jones (NYT) PHILIPPINES: CONFLICTING TESTIMONY President Joseph Estrada and his chief accuser made directly contradictory statements about a $100,000 check that is a key document in Mr. Estrada's impeachment trial.
It was a key document in the development of punk as well as an album that neatly bookends the two decades of rock'n'roll that began with Elvis in 1956.
There, as elsewhere, the show includes a key document--the Ostromir Lectionary from the Russian National Library in St Petersburg.This is the earliest surviving codex in Cyrillic.
We propose a key value document generation algorithm and present how a key value document and its schema can be designed to check whether predefined key constraints are satisfied.
Tate has issued this key document in a nice new edition.
It is the key document in a crackdown that pits free-spirited yogis against lumbering state governments, which, unlike those they are trying to regulate, are not always known for their flexibility.
1. Key document review After completing a Confidentiality Agreement, we reviewed key documents including the Master Collaboration Agreement, an internally-produced investigator's guide to the partnership, and an internal report of a survey of investigator and staff experiences.
