Besides the Shri Sai Satcharita, what other major Guru biographies are mentioned in the preface?

The preface in Chapter 0 discusses several Guru biographies in addition to Annasaheb Dabholkar's Shri Sai Satcharita. The most prominent one is the Brihat or Thorale Guru Charitra by Shri Saraswati Gangadhar, which is described as being well-known and studied daily. Chapter 0 also mentions two shorter biographies of Sai Baba by Shri Dasganu Maharaj, found in his Bhaktalilamrut and Bhaktisaramrut. Furthermore, it references a scholarly biography by Shri Samarth Sadguru Vasudevanand Saraswati Maharaj, though it is noted as not being as famous, and an unprinted biography by Shri Samarth Sadguru Dattatreya Maharaj of Balekundri.