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These are some possible categories/formats of materials you might find. Of course, technologies available at the time of the event will determine some categories: Film newsreels are not going to be found if you are searching the Dark Ages!
Print
Newspapers
Memoir
Diary or diaries
Letters (note the term 'Correspondence' is the LoC subject heading subdivision)
Maps
Personal narrative (this is a LoC subject heading subdivision)
Journal (not the scholarly publication, but more like a diary)
Government reports and publications
Oral history transcriptions
Image or sound file
Photographs/slides/prints
Paintings or drawings (may be a high-resolution photograph)
Newsreels
Television shows
Newscasts
Music recordings and videos
Oral history recordings
Realia (objects)
Artwork
Buildings
Toys and games
Clothing
Furniture
Souvenirs
Scrapbooks
Ephemera (items created for short-term or one-time use such as flyers, brochures, ticket stubs)