Looking for twentieth-century articles published before 1984?  Try the Wilson Retrospective Indexes:

Applied Science & Business Retrospective (1913-83)
Art Retrospective (1929-84)
Education Index Retrospective (1929-83)
Humanities & Social Sciences Index Retrospective (1907-84)
Index to Legal Periodicals Retrospective (1908-81)
Readers’ Guide Retrospective (1890-1982)

They can be searched individually or together: