Dasan. Regarding the book, "Vedanta Desika, his life, works and philosophy" the book was available with Dr. Sri Seshadri, President, vadakalai adhyapaka Ghoshti, Srirangam. The book, published somewhere in 1957, was in such a state that it can not be xeroxed. The professor told me the book is the property of a local college and added that it is an authority on Swami Desika. I am also in search of the book. Whoever gets it first shall inform each other.
Sapthathi Ratha malika is now appearing with the commetary of Dr. Vedanta Desikan swamin in "Sri Hayagriva Priya" Desika NUtrandhathi by Mannappa Iyengar is frrely available. The book was published and released at Thiruppullani during the Samprokshanam of Srimad Andavan Ashramam Desikan Sannadhi (HH Srimad Andavan released the book published by Madurai Desika Sabha). This is also regularly appearing in "Sri Hayagriva Priya" with commentary by Oppiliappankovil Gopala Desikachariar swami.