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On the search results page, Oxford Reference Premium offers a series of post-search filtering options on the left side of the page under the heading "Narrow Your Choices":
By default, Oxford Reference Premium shows all content in the results, which includes articles that are not available in full-text. Item availability is indicated to the right of the result with a green open lock , the word Free in a green oval , or a red closed lock .
To limit the results list to items that are available in full-text, check the "Unlocked" and "Free" boxes under the heading "By Availability" in the left side menu and click submit: