Primary Sources for German Americans
Library of Congress Digital Collections: A great way to search is to browse by topic. See the link at the bottom and it will take you to information about World War II.
http://www.loc.gov/library/libarch-digital.html
National Archives: World War II Records; Browse the full list of topics
http://www.archives.gov/research/military/ww2/
"Teacher Oz's Kingdom of History - World War II." Internet. Database available online.
http://www.teacheroz.com/wwii.htm
New York Public Library: Digital Gallery.
http://digitalgallery.nypl.org/nypldigital/index.cfm