Changes to Regulation No 91/66/EEC of the Commission of 29 June 1966 concerning the selection of returning holdings for the purpose of determining incomes of agricultural holdings
EU Regulation No 91/1966
Made by Regulation No 349/67/EEC of the Commission of 25 July 1967 amending the dates and the time limits for the forwarding to the Commission of the lists mentioned in Regulation No 91/66/EEC concerning the selection of returning holdings
From legislation.gov.uk's record of changes, the official one: see it there.