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How many working days in year 1904?
Here is the detail of the calculation:
Because 1904 is a leap year, it has 366 days.
Let's remove 53 saturdays and 52 sundays. It remains 261 days.
Now, let's remove 9 public holidays that do not fall during a weekend and we obtain 252 working days in 1904.
 Here is the list of these 9 public holidays: 
 
 1. Año Nuevo : Friday, 1 January, 1904 
2. Viernes Santo : Friday, 1 April, 1904 
3. San Pedro y San Pablo : Monday, 27 June, 1904 
4. Asunción de la Virgen : Monday, 15 August, 1904 
5. Día de las Glorias del Ejércitos : Monday, 19 September, 1904 
6. Día del Descubrimiento de Dos Mundos : Monday, 10 October, 1904 
7. Día Nacional de las Iglesias Evangélicas y Protestantes : Monday, 31 October, 1904 
8. Día de Todos los Santos : Tuesday, 1 November, 1904 
9. Día de la Inmaculada Concepción : Thursday, 8 December, 1904 
And here are the 6 public holidays falling on a weekend:
1. Sábado Santo : Saturday, 2 April, 1904 
2. Día Internacional de los Trabajadores : Sunday, 1 May, 1904 
3. Día de las Glorias Navales : Saturday, 21 May, 1904 
4. Virgen del Carmen : Saturday, 16 July, 1904 
5. Fiestas Patrias : Sunday, 18 September, 1904 
6. Navidad : Sunday, 25 December, 1904