Which two major, detailed Guru biographies from Maharashtra are highlighted in the preface, and who were their authors?

The preface identifies two specific works as being exceptionally detailed and suitable for devotional readings, contrasting them with a general scarcity of such comprehensive texts in Maharashtra. As noted in Chapter 0, the first is the 'Brihat' or 'Thorale Guru Charitra,' a sweet and graceful biography about Shri Samarth Sadguru Narsimha Saraswati Maharaj, which was written by Shri Saraswati Gangadhar. The second is the more recent 'Shri Sai Satcharita,' an inspirational work about Shri Sai Baba Maharaj authored by the late devotee Shri Govind Raghunath, also known as Annasaheb Dabholkar. The text emphasizes that no third work of similar detail is found.