The text mentions several Guru biographies. Besides the most well-known ones, what other, less famous works are discussed?

The preface in Chapter 0 discusses several Guru biographies that are not as widely known. It mentions a detailed and scholarly biography written by Shri Samarth Sadguru Tembhe Swami, also known as Vasudevanand Saraswati Maharaj. However, this work is noted as not having become as famous as the one by Shri Saraswati Gangadhar. Another mentioned text is a Guru biography by Shri Samarth Sadguru Dattatreya Maharaj of Balekundri, which had not been printed or published at the time of writing. Finally, it refers to a distinct, older work from Wadi called the Laghu Guru Charitra.