When was this clue last seen?

This clue last appeared in the NYT Mini on Tuesday, 15 September 2015.

British ref. work that took 70 years to complete

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Keywords

completebritishyears

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This clue appeared in the NYT Mini on Tuesday, 15 September 2015. The answer OED is a 3-letter entry.

This answer appears frequently in crosswords. View OED answer history →

What is the answer to "British ref. work that took 70 years to complete"?: OED
How many letters is the answer to "British ref. work that took 70 years to complete"?: The answer has 3 letters.
When was this clue last seen?: This clue last appeared in the NYT Mini crossword on Tuesday, 15 September 2015.
Has this crossword clue appeared before?: Yes. Variations of this clue have appeared 30 other times.

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