NYSE Holidays from 1911-1920. The New York Stock Exchange had a two hour trading session on Saturdays from 10am to 12PM Noon.
NYSE Holidays for 1911, 1912, 1913, 1914, 1915, 1916, 1917, 1918, 1919, 1920
NYSE Holidays for 1911, 1912, 1913, 1914, 1915, 1916, 1917, 1918, 1919, 1920
