Worldcat is a database containing catalog records from libraries around the world. This is a great place to identify materials you might want to request on interlibrary loan, if our library doesn't own them.
Indexes items owned by libraries throughout the U.S. and internationally. Items not owned by Texas State may be requestable via interlibrary loan.
Start by doing a subject search in the catalog for Nationalism- Germany"
Look at the various subjects that come up in addition to that general subject heading search.
See something that looks interesting? Look at the subject headings for the book you are interested in. Click on any of those to find similar books.
Anson Rabinbach and Sander L. Gilman, Eds. The Third Reich Sourcebook (University of California Press, 2013) [available as an E-book from Alkek]
Roderick Stackelberg and Sally A. Winkle, The Nazi Germany Sourcebook: An Anthology of Texts (Routledge 2002) [available as an E-book from Alkek]
The Persecution and Murder of the European Jews by Nazi Germany, 1933–1945 (PMJ)/ Die Verfolgung und Ermordung der europäischen Juden durch das nationalsozialistische Deutschland 1933–1945 (VEJ), a collaborative publication by the Deutsche Forschungsgemeinschaft, the Institut für Zeitgeschichte, the Bundesarchiv, Universität Freiburg, and Yad Vashem
Vol. 1: German Reich, 1933–1937
Vol. 2: German Reich, 1938–August 1939
Vol. 3: German Reich and Protectorate, September 1939–September 1941
Vol. 5: Western and Northern Europe, 1940–June 1942
All volumes available for free download in German at same link.