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Your request mentioned "install." to read these PDFs. All modern devices (Windows, Mac, Android, iPhone) have built-in PDF readers. Be extremely wary of any website that asks you to download an "app" or "software" to view free books—that is a common vector for viruses.
If you want to look for more specific titles, use these keywords in the Internet Archive Search Bar : "Tantra Mantra Yantra" language:Hindi "Shakti Sadhana" Hindi PDF "Narayan Dutt Shrimali" Hindi 3. How to "Install" (Download) to Your Device
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