Some examples include:
books, magazine and newspaper articles published at the time, literary manuscripts, hand-written documents like diaries and journals, maps laws & court cases, speeches, interviews, letters, memoirs and autobiographies, records of government agencies, records of organizations, public opinion polls, fiction from a particular time and place, research data, religious or philosophical texts, artifacts of all kinds: physical objects, furniture, tools, clothing, etc., photographs, audio recordings, movies and videos, art, including paintings, prints and other media.