The first category is books and newspapers, including historical records, historical works, document compilation and group members outside the history department.
The second category is documents, including government documents, group documents and private documents.
The third category is physical objects, including production tools, means of subsistence and relics of historical events.
The fourth category is word of mouth, including memoirs, investigation records, mass legends and literary works.
Extended data
Images: such as paintings, murals, embroidery patterns, etc. It is helpful to understand people's life and aesthetics at that time. The most famous historical image is The Riverside Scene at Qingming Festival, which is helpful to study urban life in Song Dynasty.
Physical objects: including ancient buildings, furniture, clothes, utensils, ornaments, coins and tombs, used to explore people's lives and concepts at that time. Most of these historical materials were excavated by archaeology.
Custom category: Based on the observation of current popular custom culture, it is the basis for discussing historical phenomena. For example, by studying the folk belief rituals left over from today, we can understand the ancient situation. Or from the study of primitive people that still exist, we can infer the lifestyle of early ancients.
Baidu encyclopedia-historical materials