When it comes to preparing research reports or seminar papers, you probably need to find PDF files online for reference. After entering your query on Google, it surely does its job well but it does not show particularly the file types you want. You can use two online services to do this or you can say PDF search engines.
PDF Database is one such new tool which uses a unique system for searching PDF and doc files from all over the net. Its database is huge- more than 7million PDF and document file and still it growing.
PDF Search Engine is another excellent option which displays relevant results after entering the keyword of the document you want. These both services have great database and response time is also nice.
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