This volume, edited by Norman Zide, gives 'a fairly accurate picture of the current state of our knowledge of the comparative linguistics of [Austroasiatic-Vietnamese-Muong]' as of 1966. It includes contibutions by most linguists then working in the area, with the notable exceptions of H.L. Shorto and Robery Shafer.
This book is copyright 1966 by Mouton & Co., Publishers, The Hague, The Netherlands. It is out of print.