There were thousands of first hand accounts of D-Day, many used in books . Look at WW2 in your library, you will find lots about D-Day.
primary source
Intended audience
They contain firsthand accounts of events.
They contain firsthand accounts of events.
They contain firsthand accounts of events.
They were both written. They are both firsthand accounts by men who were there.
Robert D. Marcus has written: 'Age of McCarthyism/Plunkitt of Tammany Hall/America Firsthand' 'America firsthand' -- subject(s): Sources, History 'A brief history of the United States since 1945' -- subject(s): History
The description shouldn't be there. The answer to the question is "They provide firsthand accounts of historical events."
The article is primary if it presents original research or firsthand accounts, while it is secondary if it analyzes or interprets existing information from other sources.
Newspaper articles are considered primary sources because they provide firsthand accounts of events or information at the time they occurred.
Robert D. Hall has written: 'Getting ready for NOW accounts' -- subject(s): NOW accounts
D. A letter written from an eyewitness to events