My references for the raw data on which these calculations are based are the impeccable authorities Arthur E. Mourant, The Distribution of the Human Blood Groups and Other Polymorphisms (Oxford Monograph series, 1954); Theodosius Dobzhansky, Mankind Evolving: The Evolution of the Human Species (Yale Univ. Press, 1962); and Curt Stern, Principles of Human Genetics (W.H. Freeman, 1973).