Correspondence between John Nye and Anthony Kelly concerning piezoelectric coefficients Correspondence between Nye and Kelly, the Vice-Chancellor at the University of Surrey, concerning a paper by R A Anderson and R G Keppler, titled 'Inequality of direct and converse piezoelectric coefficients'. This paper was published in 'Ferroelectrics' in 1981. The letters include Nye's thoughts on the paper, as well as a report by David Gibbs on the same topic. Also present are some manuscript notes by Nye, and a photocopy of Anderson and Keppler's paper. 1986