Besides the works of Dabholkar and Dasganu Maharaj, what other Guru biographies are mentioned in the preface?

The preface mentions several other Guru biographies. As detailed in Chapter 0, the first is the 'Brihat or Thorale Guru Charitra' by Shri Saraswati Gangadhar, which is described as well-known and widely studied. The text also recalls a detailed and scholarly Guru biography written by Shri Samarth Sadguru Tembhe Swami, also known as Vasudevanand Saraswati Maharaj, though it is noted as not having achieved the same level of fame. Finally, it is mentioned that Shri Samarth Sadguru Dattatreya Maharaj of Balekundri has also written a Guru biography, but this work had not yet been printed or published.