Sri Tattva (Hindi)

• "Śrī Tattva" (or Devi Tatva) appears in a list of his recorded audio/video discourses: "Devi Tatva Part 03," "Devi Tatva Part 04," etc. This suggests he gave talks or discourses on the subject of Tattva (principle/reality), specifically the Devi Tattva (Principle of the Divine Mother).
• A book authored by him is listed as "सप्ताह संवित्: Seven Days in Samvit".
• While there is an association with the concept of Tattva and the title Śrī Tattva could be a transcription or reference to his philosophical discourse series, a standalone book with the exact title "Śrī Tattva" is not definitively listed as one of his publications.

Conclusion:

The term "Śrī Tattva" (or Devi Tatva) is likely the subject matter of a series of discourses or a publication by Parivrajakacharya Param Poojya Swami Shri Ishwarananda Giriji Maharaj (the founder of Samvit Sadhanayana).