Which two detailed Guru biographies are highlighted as being uniquely suitable for Parayans and Saptahs in Maharashtra?

The text identifies two specific works as being exceptionally detailed, comprehensive, and famous for devotional readings like Parayans and Saptahs. The first, as mentioned in Chapter 0, is the biography of Shri Samarth Sadguru Narsimha Saraswati Maharaj, written by Shri Saraswati Gangadhar, which is now famous as the Brihat or Thorale Guru Charitra. The second is the more recent biography of Shri Sai Baba, titled Shri Sai Satcharita, written by Annasaheb Dabholkar. The preface explicitly states that apart from these two, no third work written in such detail is found.