Raghavendra mahimai (tamil) volumes 1to 8

this book is a very detailed research on guru raghavendra. The most interesting thing about this book (rather series) is that it does not just talk about the miracles by Gururaya, but also explains in details why miracles take place, and the author has very neatly covered the ancient sages and works starting Sri Madhwacharya and the other gurus in his lineage. hare krishna....