The default screen in the subscription version of WorldCat is the advanced search screen.
This is an example results screen.
This is an example subscription WorldCat record.
Google Books allows you to search the full text of some books. Many will be under copyright and you won't be able to see the full text, but you can then search SOUTHcat or WorldCat to see if you can obtain a copy. Public domain titles will often be available in the full text.