Answered By: Rajen Munoo Last Updated: May 26, 2016 Views: 108
Google allows you to refine your search by file format (e.g. pdf, ppt, xls, doc)
Try this: cloning filetype:pdf or "global warming" filetype:doc or "corporate social responsibility" filetype:ppt
You will notice all your results will be in in the format indicated in the search. You can find useful reports, government papers and policies etc this way.