The number of scientific journals in publication is probably in the thousands, and many more have been published at various points in the past. The following list is far from comprehensive:
... 1930s 1940s 1950s
Years: 1899 1900 1901 1902 1903 - 1904 - 1905 1906 1907 1908 1909
See also:
1904 in film
1904 in literature
1904 in music
1904 in ...