AltaVista also offers other potential sources that are similar to the identified topic. It produces far too much data that is not of relevance to the query, and there are singular links for each page on a site. Searching on Yahoo can be overwhelming. What is valuable about it is is their category options on the first page. Some of the other single engines have these, and it's a good starting off point to try to figure out that for which you are looking.
Inference is a powerful search engine.
It goes out, searches multiple search engines at once, sorts the data, and eliminates the duplicates all in a matter of seconds. It frequently sorts the results by site. If one link is bad on a site, and two links are bad, a searcher can usually skip the whole site. Using Inference is simple. You put in your refined query and use the pull-down menu below the query box to identify the number of seconds on which you want it to search.