Using Search It, you can find books on your topics that can provide historical and cultural context—or just provide you with a new perspective. There are a number of ways you can search for books, such as by title or author if you know it, but sometimes you need to do more specific searching—and for that, I recommend using Library of Congress Subject Headings.
By searching for subject headings, you are searching for what the items are about, rather than what words the record might contain. How do you know what the Subject Headings are? If you have found a book and are looking at its details in Search It, you can look to see what Subject Headings it is being classified with. You can click on a Subject Heading in the item's details tab to view other books listed under that same Subject Heading.
Additionally, from Search It Advanced page, you can put in a Subject Heading that you already know and change the Search By to "in subject" on the K-state Libraries Only tab. Here's a picture of what that looks like: