JSTOR Early Journal Content

Early Journal content in JSTOR is a selection of freely accessible journals published prior to 1923 in the United States and prior to 1870 elsewhere. The “Early Journal Content” selection of titles includes "discourse and scholarship in the arts and humanities, economics and politics, and in mathematics and other sciences. It includes nearly 500,000 articles from more than 200 journals. This represents 6% of the content on JSTOR".

http://about.jstor.org/participate-jstor/individuals/early-journal-content