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How many working days in year 1909?
Here is the detail of the calculation:
Because 1909 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 8 public holidays that do not fall during a weekend and we obtain 253 working days in 1909.
 Here is the list of these 8 public holidays: 
 
 1. Año Nuevo : Friday, 1 January, 1909 
2. Epifanía del Señor : Wednesday, 6 January, 1909 
3. Jueves santo : Thursday, 8 April, 1909 
4. Viernes Santo : Friday, 9 April, 1909 
5. Fiesta nacional de España : Tuesday, 12 October, 1909 
6. Todos los Santos : Monday, 1 November, 1909 
7. Día de la Constitución Española : Monday, 6 December, 1909 
8. Immaculada Concepcíon : Wednesday, 8 December, 1909 
And here are the 4 public holidays falling on a weekend:
1. Fiesta del Trabajo : Saturday, 1 May, 1909 
2. Día de Canarias : Sunday, 30 May, 1909 
3. Asuncíon de la Virgen : Sunday, 15 August, 1909 
4. Día de Navidad : Saturday, 25 December, 1909