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How many working days in year 1982?
Here is the detail of the calculation:
Because 1982 is not a leap year, it has 365 days.
Let's remove 52 saturdays and 52 sundays. It remains 261 days.
Now, let's remove 12 public holidays that do not fall during a weekend and we obtain 249 working days in 1982.
 Here is the list of these 12 public holidays: 
 
 1. New Year's Day : friday, january 1, 1982 
2. Martin Luther King Day : monday, january 18, 1982 
3. Lincoln's Birthday : friday, february 12, 1982 
4. Memorial Day : monday, may 31, 1982 
5. Juneteenth (observance) : friday, june 18, 1982 
6. Independence Day (observance) : monday, july 5, 1982 
7. Labor Day : monday, september 6, 1982 
8. Veterans Day : thursday, november 11, 1982 
9. Thanksgiving : thursday, november 25, 1982 
10. Black Friday : friday, november 26, 1982 
11. Christmas (observance) : friday, december 24, 1982 
12. New Year's Day (observance) : friday, december 31, 1982 
And here are the 3 public holidays falling on a weekend:
1. Juneteenth National Independence Day : saturday, june 19, 1982 
2. Independence Day : sunday, july 4, 1982 
3. Christmas : saturday, december 25, 1982