Research the historical period in which the work was written.
United States Holocaust Memorial Museum - in Washington D.C. has first person and historical information on the Holocaust. Very comprehensive. Look at the Resources for Academics link under the menu; if you have a question, you can ask a research question of a librarian at the museum. https://www.ushmm.org/
Los Angeles Museum of the Holocaust - has first person and historical information; there is a virtual tour link of the museum. (If you go, it is very interactive, and in certain sections, tries to have you experience some of the feelings the inmates may have felt.) http://www.lamoth.org/
Museum of Jewish Heritage in New York has numerous exhibits about the Holocaust and primary sources online https://mjhnyc.org/
Auschwitz, Bergen-Belsen, Treblinka
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The Nazis set up concentration and death camps in order to isolate, torture, and murder millions of men, women, and children. Author Ann Byers details the system of camps in Europe during the Holocaust. Byers recounts the horrifying conditions suffered by camp inmates as well as their struggles for life and hope in a world gone mad. The remains of many camps still stand today to serve as a chilling reminder of the Holocaust.
The Holocaust: Origins, Implementation, Aftermath
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Holocaust: Origins, Implementation, Aftermath presents a critical and important study of the Holocaust. Complete with an introduction that summarizes the state of the field, this book contains major reinterpretations by leading Holocaust authors along with key texts on testimony, memory, and justice after the catastrophe.