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How many working days in year 1952?
Here is the detail of the calculation:
Because 1952 is a leap year, it has 366 days.
Let's remove 52 saturdays and 52 sundays. It remains 262 days.
Now, let's remove 11 public holidays that do not fall during a weekend and we obtain 251 working days in 1952.
 Here is the list of these 11 public holidays: 
 
 1. Año Nuevo : Tuesday, 1 January, 1952 
2. Viernes Santo : Friday, 11 April, 1952 
3. Día Internacional de los Trabajadores : Thursday, 1 May, 1952 
4. Día de las Glorias Navales : Wednesday, 21 May, 1952 
5. Virgen del Carmen : Wednesday, 16 July, 1952 
6. Asunción de la Virgen : Friday, 15 August, 1952 
7. Fiestas Patrias : Thursday, 18 September, 1952 
8. Día de las Glorias del Ejércitos : Friday, 19 September, 1952 
9. Día Nacional de las Iglesias Evangélicas y Protestantes : Friday, 31 October, 1952 
10. Día de la Inmaculada Concepción : Monday, 8 December, 1952 
11. Navidad : Thursday, 25 December, 1952 
And here are the 4 public holidays falling on a weekend:
1. Sábado Santo : Saturday, 12 April, 1952 
2. San Pedro y San Pablo : Sunday, 29 June, 1952 
3. Día del Descubrimiento de Dos Mundos : Sunday, 12 October, 1952 
4. Día de Todos los Santos : Saturday, 1 November, 1952