As of June 2000 JSTOR provides access to the below journals within a 5 year moving wall timeframe

American Economic Review Vols. 1-84, 1911-1994
Econometrica Vols. 1-62, 1933-1994
Economic Journal Vols. 1-104, 1891-1994
Journal of Applied Econometrics Vols. 1-9, 1986-1994
Journal of Economic History Vols. 1-54, 1941-1994
Journal of Economic Literature Vols. 1-32, 1963-1994
Journal of Economic Perspectives Vols. 1-8, 1987-1994
Journal of Industrial Economics Vols. 1-42, 1952-1994
Journal of Money, Credit and Banking Vols. 1-26, 1969-1994
Journal of Political Economy Vols. 1-102, 1892-1994
Quarterly Journal of Economics Vols. 1-109, 1886-1994
Review of Economic Studies Vols. 1-63, 1933-1996
Review of Economics and Statistics Vols. 1-76, 1919-1994