The preface mentions two particularly famous and detailed Guru biographies from Maharashtra. What are they and who wrote them?

The preface highlights two specific works as being detailed, comprehensive, and famous in Maharashtra, making them suitable for Parayans and Saptahs. As detailed in Chapter 0, the first is the Shri Guru Charitra, a sweet and graceful biography written by Shri Saraswati Gangadhar about Shri Samarth Sadguru Narsimha Saraswati Maharaj. The second is the more recent Shri Sai Satcharita, an inspirational biography of Shri Sachidanand Samarth Sadguru Sai Baba Maharaj, which was written by the late devotee Shri Govind Raghunath, also known as Annasaheb Dabholkar.