Can you tell me about the most significant written works concerning Shri Sai Baba and other Gurus mentioned in the preface?

The source material highlights two particularly detailed Guru biographies. The first is the well-known Brihat or Thorale Guru Charitra by Shri Saraswati Gangadhar. The second, and the focus of the preface from which this information is drawn, is Shri Sai Satcharita, written by the devotee Shri Annasaheb Dabholkar about Shri Sai Baba. As noted in Chapter 0, these two are considered the most detailed works of their kind. Additionally, Shri Dasganu Maharaj, a foremost modern poet, authored two shorter, yet excellent and heart-touching, biographies of Baba that are also mentioned in Chapter 0.