Another major difference between this type of special library to other traditional libraries is that museum libraries are usually focused on one subject or field of study, rather than covering all subject areas. Such areas of study museum libraries focus in on include art, history, science, and other more specific fields. These areas the libraries focus on also depends on what museum they work and are associated with. The libraries within the MET and the Art Institute of Chicago, both art museums, focus on art and its history. While the National Museum of Natural History Library of Washington D.C. focuses on natural history because of its collaboration with the museum which bears the same name. Museums and libraries collaborate and work with each other in order for both to function properly. Without one, the other could not survive.