You can access Oxford Reference from any computer though you will need to have your library card handy if you are not on a library computer. Go to the library’s webpage for Research & Homework and scroll down to the O’s to find access to the resource (http://www.lapl.org/collections-resources/research-and-homework#O).
Once logged in you can do a global search across all their titles or browse by subject. Search result screens provide you with options for refining your search. Go explore it.