Search Engines…Regular or High test

In looking about on the search engines of Yahoo, Google, Google Scholar and Refseek I found a distinct difference in the content shown. With the standard Yahoo and Google searches you will get mostly blogs, articles by anyone (usually duplicated from site to site) and news. Both Yahoo and Google of course show Wikipedia as a source.  When I looked upon Google Scholar and the other specialized reference sources the search was more focused. No repetitive articles or blogs. This was a nice change to bring in actual books and pdfs with authors indicated and sites to go to.  A digital library such as HEIN Online that was not indicted in the regular searches amid the plethora of Wikipedia and duplicated articles and news was exceptionally nice to see.