Search under the "Books, Images, and more" tab to find books, journals (when you know the title), and media that Northwestern owns. You can use keywords in Basic search (the system assumes you want all of the words) or be more specific with Advanced search. The facets on the left of the search results allow you to refine searches.
(You many want to limit language to English).
Here are some search examples:
fin-de-siecle Vienna in Basic search
Arthur Schnitzler as Author (to find books by Schnitzler)
Arthur Schnitzler as Subject (to find books about Schnitzler)
Modern Austrian Literature as Journal title
Vienna AND Jews AND 19th century in Anywhere (i.e., keywords)
To find books not available at Northwestern: many WorldCat titles will be available through Interlibrary Loan.