Ref. work that took more than 70 years to complete

Let's find possible answers to "Ref. work that took more than 70 years to complete" crossword clue. First of all, we will look for a few extra hints for this entry: Ref. work that took more than 70 years to complete. Finally, we will solve this crossword puzzle clue and get the correct word. We have 1 possible solution for this clue in our database.