This book discusses ancient law in India and is very interesting. The dates given in this book do not match the dates given in this site, but that does not impede the flow.
Published by Munshiram Manoharlal, it was priced at 350, not sure if the price has been revised.
The author is an advocate and a lecturer and a sanskrit scholar. The book was first published in 1978.
He explains how these 3 smRtis have been reconstructed from references in various commentaries. Like I have already said – the book is gripping.