The International Practical Temperature Scale of 1968 English version of the official French text
National Physical Laboratory (Great Britain)
London H.M.S.O.
1976
'The National Physical Laboratory, Teddington, is responsible for establishing the IPTS for Great Britain ... ' - Foreword
Previous ed.: 1969
Translation of : 'L'Echelle internationale practique de température' published in 'Comptes Rendus des Séances de la Quinziéme Conférence Générale des Poids et Mesures, 1975'
International Practical Temperature Scale of 1968.