: Authored by Pt. Laxmi Narayan Sharma, this book focuses on practical spiritual practices. Yantra Mantra Kalp Sangrah
Here are some well-known titles you can find (search exactly as written in Hindi or transliterated):
Note: Some books may be in older Hindi (Braj/Awadhi) or Sanskrit with Hindi commentary.
Finding reliable Hindi books on on the Internet Archive is a great way to access rare, digitized texts from the Digital Library of India and other historical collections.
The Internet Archive has an impressive collection of Tantra, Mantra, and Yantra books in Hindi. Some of the popular books available include: