How to Google search only PDF files?

What to write in search of what would be displayed in search results for only PDF documents?
June 10th 19 at 16:35
1 answer
June 10th 19 at 16:37

and you can exclude which do not contain this format to only contain the PDF and display only (and if not to was that "Nothing found")? - Linnie_Shanahan commented on June 10th 19 at 16:40
, 5a2cc33fdb82e750839895.jpeg - Leda15 commented on June 10th 19 at 16:43

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