What are the most significant written works about Gurus, particularly Sai Baba, mentioned in the preface?

The preface highlights two major Guru biographies. The first is the 'Brihat or Thorale Guru Charitra' by Saraswati Gangadhar, which is widely studied. The second, and the focus of the preface, is the 'Shri Sai Satcharita' by Annasaheb Dabholkar, a detailed biography of Shri Sai Baba Maharaj. This work was published chapter by chapter in the 'Shri Sai Leela' magazine. As noted in Chapter 0, apart from these two, no other work of similar detail was widely known at the time of writing, establishing them as the paramount examples of Guru biographies.