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

The preface in Chapter 0 identifies the 'Brihat or Thorale Guru Charitra' by Shri Saraswati Gangadhar as another major Guru biography, which is well-known and studied daily. It also mentions a detailed and scholarly biography written by Shri Samarth Sadguru Tembhe Swami, though it is noted as not having achieved the same level of fame. Furthermore, Chapter 0 states that there is talk of a Guru biography written by Shri Samarth Sadguru Dattatreya Maharaj of Balekundri, but it does not seem to have been printed or published yet, distinguishing it from the other available works.