Volume 1: "The statute and case-law herein stated is as on 28th February 1974"; volume 2: "The statute and case-law herein stated is as on 30th April 1975" volume 3: "The statute and case-law herein stated is as on 31st August, 1975"; volume 4: "The statute and case-law stated is as on 31st March 1976."