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How can I identify older medical journal articles?

To identify articles published from:

1946 - present, search PubMed®. Your retrieval will include both MEDLINE® and OLDMEDLINE records, as well as some other citations not indexed with Medical Subject Headings (MeSH®).
Before 1946, there are a small number of citations included in PMC: PubMed Central, searchable via PubMed. Otherwise, there are no online sources from NLM except for IndexCat™. You need to use Index Medicus® and the other print sources that are described below. These sources can be found at many medical and large university libraries. Note: Index Medicus® ceased hard copy publication with the Dec 2004 edition (Volume 45).

Index Title	Years	Call Number	Number of Volumes	Publisher	Description
Index Medicus (IM)	1879-1926	ZW1 I383	45 volumes in 3 series; 1879-1899, 1903-1920 including war supplement 1914-1917, 1921-1926	Edited by John Shaw Billings, Robert Fletcher, et al.; Published by F. Leypoldt, Carnegie Institution, etc.	Journals, books, pamphlets indexed; Subject arrangement with author indexes; intended to supplement the Index-Catalog, contains some material not in the Index-Catalog.
Bibliographia medica	1900-1902	ZW1 B5836	3 volumes	Edited by Marcel Baudouin; Published by Institut de Bibliographie, Paris	Publication of Index Medicus was suspended from 1899-1902. In the interval, a similar index was issued in Paris by the Institut de bibliographie. In French.
Index-Catalog of the Library of the Surgeon-General's Office (ICLSGO) IndexCat	1880-1961	Z 675 .M4 I38	61 volumes in 5 series; 1880-1895, 1896-1916, 1913-1932, 1936-1955, 1959-1961	Library of Surgeon-General's Office, Army Medical Library, Armed Forces Medical Library, and GPO (Government Publishing Office)	Journals, books, pamphlets, theses indexed; Journal articles listed only under subject; Subject-author arrangement each series A-Z, except Series 4 which is A-Mn only. Series 5 excludes journal articles and was published in 3 volumes: Volume 2 is in A-Z subject arrangement.
Quarterly Cumulative Index to Current Literature (QCICL)	1916-1926	ZW1 Q4	12 volumes	American Medical Association	Journal articles indexed; lists of new books, publishers, new gov't pubs; aimed at English-speaking, clinical, American doctors; alphabetical dictionary arrangement.
Quarterly Cumulative Index Medicus (QCIM)	1927-1956	ZW1 Q3	60 volumes	American Medical Association; Carnegie Institute helped finance 1927-1931	Journal articles indexed; list of books and publishers; dictionary arrangement.
Current List of Medical Literature (CLML)	1941-1959	ZW1 C969	36 volumes	Army Medical Library; Armed Forces Medical Library	Journal articles indexed; table of contents arrangement with author, subject indexes; use jointly with QCIM since indexed Journals not the same; 1957-1959 the ONLY index.
Index Medicus/ Cumulated Index Medicus (IM/CIM)	1960-2004	ZW1 I384	1960-2004, 45 volumes	Index Medicus: NLM ; Cumulated Index Medicus: American Medical Association (1960-1964), NLM (1965- 2004) [GPO]	Searchable on PubMed. Monthly issues with annual cumulations; subject, author indexes with complete entry under each. Publication ceased with December 2004 edition (Volume 45).