Poole's Index to Periodical Literature - Ref AI 3 .P7 1938 (6 vols.)
An index to the contents of periodicals published in the nineteenth century in England and America. Covers 1802-1881, with supplements that cover through 1906. Though less easy to use than later indexes, it offers access to articles in popular periodicals by subject. Headings are not always easy to guess--the Civil War, for example, is found under United States--Civil War.