How to combine PDF files

From Adobe Acrobat to free online editors and built-in tools, here’s how to merge multiple PDFs into one document.
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Review of 'Librum', an e-book reader that allows you to read EPUB, PDF, and more than 70,000 books for free and sync them on Windows, Linux, macOS, etc.

The open source e-book reader software ' Librum ' can read PDF and e-book files such as EPUB and MOBI data and share them as a bookshelf, as well as freely download over 70,000 free books and read ...

How to save any file as a PDF

Step-by-step instructions for creating PDFs from any file type, including methods for merging, compressing and password-protecting PDF documents securely.
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Review of Google's official Chrome extension 'Google Scholar PDF Reader' that dramatically improves the readability of paper PDF files

Google has released ' Google Scholar PDF Reader,' a Chrome extension that makes it easier to read PDF files of scientific papers. I thought it would be very useful for reading the content of the paper ...