Sites to locate primary sources
https://www.nps.gov/subjects/worldwari/index.htm
https://www.docsteach.org/topics/wwi
https://www.loc.gov/topics/world-war-i/
https://www.loc.gov/teachers/classroommaterials/primarysourcesets/world-war-i/
https://www.europeana.eu/portal/en/collections/world-war-I
https://dp.la/primary-source-sets/african-american-soldiers-in-world-war-i
http://www.eyewitnesstohistory.com/w1frm.htm
https://digital.library.unt.edu/explore/collections/wwpc/browse/?fq=untl_collection%3AWWI
http://content.libraries.wsu.edu/cdm/search/collection/propaganda
http://www.aparchive.com/compilationsclipreel/43520/19606/Conflicts_Terrorism
https://www.britishpathe.com/workspaces/page/ww1-the-definitive-collection
http://www.oucs.ox.ac.uk/ww1lit/gwa/
https://www.archives.gov/topics/wwi#event-/
https://www.bbc.co.uk/programmes/b04685bf/galleries
https://www.bl.uk/world-war-one/collection-items
https://ersterweltkrieg.bundesarchiv.de/
https://encyclopedia.1914-1918-online.net/home.html
https://www.aif.adfa.edu.au/index.html
https://www.facinghistory.org/weimar-republic-fragility-democracy/primary-sources