How many public libraries use opacs?

Special library: Law, medical, government, nongovernmental organization, prison, corporate, museum or any other type of library owned and operated by an organization are considered as special library. They can be highly specialized, serving a discrete user group with a restricted collection area. In an increasingly global and virtual workplace, many special librarians may not even work in a library at all but instead manage and facilitate the use of electronic collections. Funding for special libraries varies widely. Librarians in some types of special libraries may be required to have additional training, such as a law degree for a librarian in an academic law library or appropriate subject degrees for subject specialities such as chemistry, engineering, etc. Many belong to the Special Libraries Association. There are also more specific associations such as the American Association of Law Libraries, Art Libraries Society of North America, the Medical Library Association, or the Visual Resources Association.