IndexCat is a digital edition of the Index-Catalogue of the Library of the Surgeon-General's Office (61 volumes in 5 series, 1880-1961). Princeton also has the printed edition in Firestone 04956.922.
Index Medicus is the printed index that precedes Medline:
Index Medicus. 1879-1927. RECAP 04956.49
Quarterly cumulative index medicus. 1927-1956. Biology Library (SZ): Reference 04956.742
Current list of medical literature. 1941-1959. Annex A 04956.279
Medline and Pubmed are two different interfaces to the same index. Pubmed is free and available to the general public; Medline is a fee-based service. The index covers 1950 to the present comprehensively, with some citations to older material.
To find primary sources in the Main Catalog, use the Guided Search form to search for keywords or subject headings plus terms like:
Note: for many topics, there are highly specific subject headings like:
To find the papers of an individual, do an Author search, e.g. jackson, andrew
To find the records of an organization or government body, do an Author search, e.g. United States. Dept. of State
To find works published in a particular time and place, try limiting your search by date, language, or location (click on the orange "set limits" button on the search screen).