Race, Robert Russell Letters from R R Race and carbon copies of Penrose's replies. Correspondence dated 1946-1947 concerns A Elithorn, sampling sizes, and requests for hair samples, with an enclosed Race family tree. Correspondence dated 1966 concerns studies into chromosome deletion. Correspondence dated 1968-1969 concerns the draft paper "The problem of the inheritance of testicular feminization: some negative linkage contributions" by R Race, P Tippet, J Gavin, R Gooch [enclosed]. Also concerns Race's contributions to the Working Committee on the Family Law Reform Act 1969 regarding the provision for blood tests in determining paternity. 1946-1947