Run a search in UC Library Search and then set the facets in your results so that Availability is Available online and Resource Type is Books:
To view an ebook, click on its title or the green “Available Online” link in the search results. You will then be taken to the item record. Click on the URL(s) displayed under the “View Online” section to view the full text:
If you'd like to browse by ebook collection, visit the database list.