Chiefly ms text of lectures given in Boston (1963), Penn State University (1965), Rome (1965 - 'The Structure of KNbO3 (a perovskite-type ferroelectric)' with L Katz and R Ueda), Prague (1966 - 'The hettotypes of Sodium niobate', part of the perovskite family), York (1968 - 'Thermal Expansion and Displacive Transitions in Octahedral Niobates'), the Cavendish Laboratory (1968) and the Space Group (1968).