Before the Sai Satcharitra was written, what other literary works contained stories and teachings of Sai Baba?

According to Chapter 2, several works documenting Sai Baba's life and leelas existed prior to the Sai Satcharitra. The author explicitly mentions that the saint Das Ganu had already described the sweet life of Shri Sai in three chapters of his book, 'Bhakta-Lilamrut,' and a knowledge-story in Chapter 57 of 'Santa-Kathamrut.' Other sources mentioned include Raghunath-Savitri’s 'Bhajanmala,' miscellaneous poems by Das Ganu, works for Gujarati devotees by Amidas and Bhavani Metha, and a series of stories being published in Pune under the name 'Sai Prabha.'