Correspondence with Prof FH Spedding, Atomic Research Institute, Iowa State College On the collaborative effort between Iowa State College and the Clarendon Laboratory, to measure the specific heats of rare earth metals (cerium, neodymium and lanthinum) at low temperatures. These measurements were written up as 'The Atomic Heats of the Rare Earth Metals', 'Proceedings of the Royal Society', A, 1951, 207, 137 1949-1953