There is a PMC Journal List where you can browse a list of journals that archive some or all of their contents in PMC.
The PMC Journal List includes:
PMC is an archive containing over 3 million articles, most of which are indexed for PubMed.
For a comprehensive search, you would probably want to search both PubMed and PMC separately.
PubMed Central® (PMC) was launched in 2000 as a free archive for full-text biomedical and life sciences journal literature at the U.S. National Institute of Health's National Library of Medicine (NIH/NLM).
Free access is a requirement for PMC deposit, but publishers and individual authors may continue to hold copyright on the material in PMC and publishers can delay the release of their material in PMC for a short period after publication. There are reciprocal links between the full text in PMC and corresponding citations in PubMed
PMC also includes final, peer-reviewed author manuscripts by scientists and others who receive research funding from NIH and other funding agencies.
The PubReader view is an alternative web presentation that offers another, more reader-friendly way to read literature in PMC and Bookshelf. Designed particularly for enhancing readability on tablet and other small screen devices, PubReader can also be used on desktops and laptops and from multiple web browsers.
Searching PMC is very similar to searching PubMed, and you will find detailed help in the PMC Help manual
It includes examples for searching by subject, by author, by title, by journal name or ISSN, and by publication date.
Although many of the field names are the same as PubMed they may work in slightly different ways, so it's a good idea to check. There are also some important additional options - for example:
Field Name Abbreviations
When searching either PMC or PubMed it's important to specify where to look for words - titles of articles, abstracts, the indexing language of the database. To do this you need to use field codes.
PMC has a wide range of field codes, some of which are different from PubMed. Below is a selection of the more commonly used fields. A complete list can be found in the PMC help manual.
Fields marked ♦ will retrieve ONLY PMC articles which have also been indexed for PubMed/Medline
[article] article body - all words - includes all words and numbers in the body of an article except for the Abstract and References. Option not available in PubMed
[kwd] article body - key terms - includes all key terms in the body of an article except for the Abstract and References.
[meth] key terms from the methods section of the article abstract.
[majr] to restrict your search to major indexing terms only ♦
[refr] includes words and numbers in the titles in an article references section.
[refa] includes authors cited in an article references section.
[sect] includes words and numbers in an article section title.
[sh] MeSH Subheadings ♦
Used with MeSH terms to help describe more completely a particular aspect of a subject - for example neoplasms/diagnosis. PMC allows you to "free float" subheadings, and this can be a useful option.
[tw] Includes all words and numbers in the title, abstract and article body, as well as in table and figure captions and in the article reference section.
[ta] to search for the Medline journal title abbreviation, full journal title, or ISSN number