Numerical taxonomy; the principles and practice of numerical classification [by] Peter H. A. Sneath [and] Robert R. Sokal. Sneath, P. H. A. (Peter Henry Andrews), 1923- Sokal, Robert R., joint author. Numerical taxonomy. QH83 .S58 574.01 SNN Bibliography: p. [488]-547. San Francisco, W. H. Freeman [1973] [1973] 1973 Text xv, 573 p. eng A Series of books in biology