The text mentions two major works suitable for Parayans. What are they and who wrote them?

The preface, which is part of Chapter 0, highlights two specific works as being ancient, detailed, poetic, and famous enough for dedicated Parayans and Saptahs in Maharashtra. The first is the Brihat or Thorale Guru Charitra, a sweet and succulent biography written by Shri Saraswati Gangadhar about Shri Samarth Sadguru Narsimha Saraswati Maharaj. The second is the more recent Shri Sai Satcharita, an inspirational and grace-filled biography written by the devotee Shri Govind Raghunath alias Annasaheb Dabholkar about Shri Sai Baba Maharaj.