Papers1 is used generically to encompass materials in a variety of formats, including manuscripts, typescripts, clippings, photographs. 'Papers' connotes materials in sheets. It is sometimes used in the title of a collection, even though that collection includes bound works such as scrapbooks or diaries, and may even contain even three-dimensional artifacts. – Papers2 can be equally as encompassing in format but connotes materials associated with an individual or family, apart from official records of a business or organization.
