Here are some classic texts and authors you should look for on the Internet Archive to get started:
मंत्र तंत्र यंत्र विज्ञान अगस्त १९८९ : Ajay Uttam - Internet Archive Here are some classic texts and authors you
(February 2010) provide a more modern, investigative look into these ancient sciences. Historical Texts : Older volumes like Yantra Mantra Kalp Sangrah Here are some classic texts and authors you