General History

Most important source of historical articles:
America: History and Life (1955- ) includes books, book chapters, journal articles, and book reviews.

JSTOR offers full-text of complete runs (up to about 5 years ago) of over 400 journals. Allows simultaneous or individual searching, full-text searching optional, of many African-American studies and historical journals. List of included journals.

International Index to Black Periodicals Full Text (1900- ; full text 1998- ) indexes over 150 scholarly and popular journals, newspapers, and newsletters from the US, Africa and the Caribbean.

Web of Science Citation Indexes allow citation searching, that is, starting with an article of interest and finding more recent articles that have cited it. More information.

Periodicals Index Online indexes over 5500 English and Western European language journals from their inceptions to 1995. Includes 218 journals in American history and 840 journals in world history. Also numerous journals in related subjects. Limit to historical journals by adjusting Journal Subject(s) menu to History (General) or History (The Americas), although this will exclude historical articles in non-history journals.

The major digital libraries which contain full text of books published before 1923 plus some later government documents:

HathiTrust (the "h" is silent)

Internet Archive

Google Books

History of Medicine

In HOLLIS search:

Subject: "breast cancer" OR "breast neoplasms"
AND
Subject: History

History of Science, Technology, and Medicine (1975- ) is an index of books, book chapters, and journal articles. Some social sciences material is included. More information on this complex database.

PubMed (1947- ) is the National Library of Medicine's index to biomedical journal articles.
--Limit to historical sources: Do a search, then at the bottom of the left hand column, open Additional filters. Choose Historical Article.
--Be sure to look at the MeSH (Medical Subject Headings) on pertinent records by scrolling down to MeSH Terms.