Band of Brothers: E Company, 506th Regiment, 101st Airborne from Normandy to Hitler's Eagle's Nest by 
Sisters in Arms by 
The Bomber Boys by 
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While Discovery can be flexible with your keywords, sometimes precise subjects can help find resources. For example, instead of World War Two or II, try:
World War, 1939-1945
World War, 1939-1945 -- Campaigns -- Western Front.
World War, 1939-1945 -- Personal narratives, American.
When you are searching for primary sources, include terms such as diaries, journals, memoirs, letters, speeches, autobiography, news articles, cartoons. Depending on your topic, physical artifacts can be a primary source and can be found in online digital collections at libraries, museums, and archives.