The importance of Vaidika-Padanukrama-Kosa or A Vedic Word-Concordance as an essential book of reference towards carrying on the work of Vedic Research has since long been recognized both at the national and the international levels.  Our Institute had undertaken, in 1930, the preparation of this Concordance as planned by our Founder Director, the late Acharya Dr. Vishva Bandhu.  The project was duly completed by him and published in 5 volumes further divided into 16 parts, altogether, covering about 11,000 pages, during the years 1935-65.  As is well known, it is an authentic universal Vocabulary-Register of about 400 Vedic and sub-Vedic works with complete textual reference and comparative-cum-critical notes and other useful data pertaining to phonology, accent, etymology, grammar, metre and text-criticism.