Primary sources are materials directly related to a topic by time or participation. These materials include letters, speeches, diaries, newspaper articles from the time, oral history interviews, documents, photographs, artifacts, or anything else that provides firsthand accounts about a person or event.
Covers 500 years of the rise and fall of empires, this features a wide variety of material, including exploration journals & logs; correspondence; periodicals; diaries; government papers; missionary papers; travel writing; slave papers; memoirs; fiction; children's adventure stories; folk tales; exhibition catalogs; maps; marketing posters; photographs; and illustrations, with many in color.
You may find this library research guide useful: