Unlike search engines, academic search directories provide links to websites that are arranged by subject area and evaluated by a human being before being included in the directory. These criteria help provide higher quality results. Many search directories like Librarian's Internet Index, provide subject and keyword searching.
Examples of academic search directories are Infomine, Librarian's Internet Index, and Internet Scout Project. Many search directories can be found on the Search Engines and Search Directories page.
Over the last decade, many federal and state government publications have moved from print formats to online formats. These may be found by searching a particular agency's site directly. Alternatively, you may wish to use the following search engines.
USA.gov - Government search engine that searches both federal and state sites by keyword and subject.
Science.gov - Gateway to over 50 million pages of authoritative selected science information provided by U.S. government agencies, including research and development results.
Google's Government Search - Google's search engine searching primarily U.S. federal and state government web sites.
Open Access Journals & Databases
There are newspapers and journals available on the web for free. Newspapers can often be found on the newspapers web site. Journals may be more difficult to track down. Directory of Open Access Journals is good way to search for information in open access journals. You may search for journals on a topic, or you may search for articles across many different journals.
Google Scholar & Google Books
Google Scholar and Google Books are both projects by Google. With Google books, Google is working with libraries and publishers to help make full text and excerpts of books available online. Both will be likely to provide better sources than you might receive through the Google search engine. However, some results may not contain full text.
More about searching for articles in Google Scholar.