Users of NYTimes.com Passes:

— 1923–1980: Pass users have unlimited access to the New York Times archived articles outside the 1923–1980 date range. Each day of their pass, users may access up to five free articles published between the years 1923 through 1980.
— Pre-1923 and post-1980: Articles published before January 1, 1923 or after December 31, 1980 are free with your Pass and are not limited in any way