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Portfolio Selection, Efficient Diversification of Investments, Par HARRY-M. MARKOWITZ. (Cowles Foundation for Research in Economics at Yale University, Monograph 16). Un Vol., 6 Po. X 9¼, Relié, 344 Pages — JOHN WILEY & SONS, INC., 440, 4 Avenue, New-York 16, N.Y., 1959 ($7.50)