The preface mentions two significant Guru biographies suitable for devotional readings in Maharashtra. Can you identify and describe them?

The preface, as documented in Chapter 0, highlights a scarcity of detailed, poetic, and comprehensive works suitable for Parayan or Saptah in Maharashtra. It specifically identifies two exceptional biographies. The first is the sweet and graceful biography of Shri Samarth Sadguru Narsimha Saraswati Maharaj, written by Shri Saraswati Gangadhar, which is famously known as the Brihat or Thorale Guru Charitra. The second is the more recent, inspirational, and grace-filled biography of Shri Sachidanand Samarth Sadguru Sai Baba Maharaj, written by the devotee Annasaheb Dabholkar. This work, titled Shri Sai Satcharita, is the very text for which the preface was written.