"Microfilms" Natural Recordings by Native Speakers
Microfilms are thin strips of film coated with light-sensitive silver halide emulsion, typically 16-24 mm wide and 10-60 meters long, used for reproducing and preserving documents, photographs, and other written materials. They are often used in libraries, archives, and other institutions for permanent storage and retrieval of records, as they are more compact and durable than paper copies.