Not everyone is interest in plain text while searching on Google. Many high end researchers are interested in PDF files (as they will contain a reformed image text combination that can make life simple for a lot of information savvy professionals) while presenters and action oriented individuals prefer PowerPoint files. Use the filetype: operator to bring forth the files you are most interested in. (Examples: filetype:ppt, filetype:pdf, filetype:xls and so on). Fine more tips in this article.
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