Shree Mantra-Siddhanta

3 Brilliant Sutras devoted to Shree Mantra-Siddhanta:

"Shree ParashuRama Kalpa-Sutra", 1.7: 

वर्णात्मकाः नित्याः शब्दाः । । ७ । । 

Eternal are the words constituted of letters. 

The words constituted of letters are

36 Tattvas in "Shree ParashuRama Kalpa-Sutra"

"Shree ParashuRama Kalpa-Sutra", 1.4: 

षद्त्रिंशत्तत्त्वानि विश्वम् । । ४ । । 

Of 36 Principles is the universe. 

The whole universe is constituted of these 36 Principles of existence. They

"Bases of Tantra Sadhana - first 30 Verses of Shree ParashuRama Kalpa-Sutra", M.P.Pandit, 1972

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English annotation by Vishnudut1926: Originally found on Scribd, the book, I recommend very much. 

Apart from 30 introductory Sutras of "Shree ParashuRama Kalpa-Sutra", the book contains very notable compendium of the cites from Shakti-Granthas.

For example: