Legal Guardians: A legal concept for individuals who are designated to act on behalf of persons who are considered incapable of acting in their own behalf, e.g., minors and persons found to be not mentally competent.Skiing: A snow sport which uses skis to glide over the snow. It does not include water-skiing.Students: Individuals enrolled in a school or formal educational program.Durable Medical Equipment: Devices which are very resistant to wear and may be used over a long period of time. They include items such as wheelchairs, hospital beds, artificial limbs, etc.Students, Medical: Individuals enrolled in a school of medicine or a formal educational program in medicine.Housing: Living facilities for humans.Fraud: Exploitation through misrepresentation of the facts or concealment of the purposes of the exploiter.Medicare Assignment: Concept referring to the standardized fees for services rendered by health care providers, e.g., laboratories and physicians, and reimbursement for those services under Medicare Part B. It includes acceptance by the physician.Head Protective Devices: Personal devices for protection of heads from impact, penetration from falling and flying objects, and from limited electric shock and burn.Students, Dental: Individuals enrolled a school of dentistry or a formal educational program in leading to a degree in dentistry.Catalogs, LibraryCatalogs as Topic: Ordered compilations of item descriptions and sufficient information to afford access to them.Catalogs, UnionLibrary Technical Services: Acquisition, organization, and preparation of library materials for use, including selection, weeding, cataloging, classification, and preservation.Information Storage and Retrieval: Organized activities related to the storage, location, search, and retrieval of information.Online Systems: Systems where the input data enter the computer directly from the point of origin (usually a terminal or workstation) and/or in which output data are transmitted directly to that terminal point of origin. (Sippl, Computer Dictionary, 4th ed)Internet: A loose confederation of computer communication networks around the world. The networks that make up the Internet are connected through several backbone networks. The Internet grew out of the US Government ARPAnet project and was designed to facilitate information exchange.Cataloging: Activities performed in the preparation of bibliographic records for CATALOGS. It is carried out according to a set of rules and contains information enabling the user to know what is available and where items can be found.Subject Headings: Terms or expressions which provide the major means of access by subject to the bibliographic unit.Manuscripts as Topic: Compositions written by hand, as one written before the invention or adoption of printing. A manuscript may also refer to a handwritten copy of an ancient author. A manuscript may be handwritten or typewritten as distinguished from a printed copy, especially the copy of a writer's work from which printed copies are made. (Webster, 3d ed)