1. Museums and libraries: Many museums and libraries will collect historical relics and video materials, including black and white historical video materials. For example, the National Museum of China, the china national film museum, the Library of Congress and other institutions have a large number of historical images.

2. TV stations and film companies: In the past decades, many TV stations and film companies have filmed a large number of historical events and people, and these video materials are usually kept in the archives of TV stations and film companies.

3. Personal collection: Some people will collect historical relics and video materials and keep them. These personal collections may include black and white historical images.

4. Network resources: On the Internet, there are many websites that provide downloading and viewing of historical video materials, such as VJ Teachers' Network. These websites usually provide some black and white historical pictures.

At present, these black and white historical images are usually kept in museums, libraries, TV stations, film companies and other institutions. For example, China National Museum, china national film museum and other institutions will keep a large number of historical images. At the same time, some personal collectors and network resource providers will also save historical images.

If you want to know more about the preservation and protection of black-and-white historical images, it is recommended to contact local museums, libraries, TV stations, film companies and other relevant institutions, or learn about relevant historical image protection and research institutions.