The source mentions Baba's 'Leelas.' What were these, and how were they documented?

Chapter 0 explains that a true and complete description of Sai Baba's Leelas, or divine plays, and his infinite qualities is impossible for a person of 'childish intellect.' The text compares this task to attempting to count all the dust particles on Earth. Even so, it was believed that a collection of his Leelas would be beneficial to all. A friend of the author, Ra. Govind Raghunath, also known as Annasaheb Dabholkar, undertook this task with Maharaj's direct permission while he was still in the body, composing a large part of it in verse, with thirty-five chapters being ready at the time of this writing.