Categorised collections can take a general approach, aiming to cover all subjects or can limit themselves to certain subject areas. Examples of both types are listed below. The collection can be browsed in Dewey number order, looked up alphabetically by subject or searched for specific text. Coverage is academic rather than general. Resources can be searched for specific text or browsed alphabetically by subject heading.
Coverage is academic rather than general.
Yahoo also offers regional coverage. There is a wide range of guides to Internet resources in specific subject areas. These are usually compiled by librarians and subject specialists and bear similarities to printed subject bibliographies. Internet sites listed in them have usually been classified, evaluated and described in more detail than for general subject collections or search engine results. They are selective and will only list resources that are considered by their compilers to be of high quality.