It is important to note that many viruses have several aliases. If you are looking for information on a virus, it may be in here under a different name. A Guide to Internet Resources - From LSU Virtual Library, a well annotated hierarchical guide to resources available on the Internet, covering a broad range of topics from government to science to humanities. Wikipedia -Free, open content encyclopedia project with over 9,000 entries. It has an index of geographic regions and mountain ranges and another of individual peaks and volcanoes.
Visual indexing is offered through clickable relief maps.