search just within wiki results?

Is there a way to set up a search page that ONLY yields results from the wiki pages?

We are trying to set up on a blog about national security law, a document library of primary sources, and we want that library to be searchable without yielding results from the rest of the blog. I need to have on the front page of the wiki a search bar that will search the wiki BUT NOT the rest of the site. Any suggestions?