A few years ago I came across a book on Sanskrit (not a dictionary, not a grammar book, not a book on Sanskrit literature( that belonged to the "Classical Language Series" from either Oxford or Cambridge -- about a 1000 pages. The book looked at the history of how the language developed from proto-indo-european and also included words borrowed from Tamil and Kannada into Sanskrit at Vedic times (shows those other languages were equally ancient). I later came across it in google scholar or other service that digitized the book and made it available to the public. I am trying to find this book. Can you help?