3 ms·

Add filetype:pdf to your query.

• tbgvi 17y ago
  Agreed, advanced search is your friend when looking for solid research. In addition to looking for pdf's I often get better results filtering by .edu sites as well.
  • imurray 17y ago
    That will miss many non-US institutions. For example, UK universities use .ac.uk
    • benwr 17y ago
      If you want to include them, boolean logic still works for advanced search tags. You can search for 'somethingorother site:.edu OR site:.ac.uk'