It is sometimes useful to have a list of MEDINE journal titles categorized by their subject areas.  The web page,  Broad Subject Terms for Indexed Journals, provides this information for 120 subject areas.  The page is under the auspices of the National Library of Medicine.  This document can be useful for conducting a PubMed search for articles on drowning, for example, where you want to limit the output only to Emergency Medicine journal titles.