Open Access resources in Articles+ represent a variety of content types including books, journal articles, images, reports from a variety of sources such as content repositories, open access journals, and subscription databases. Some sources may come from "hybrid' sources of open access and non-open access content.
On the initial search screen, an Open Access limit is available under Refine Your Search on the left of the search screen:
Also, in the Search Results screen, you will see this open access indicator 
