Cluster analysis / by Robert Choate Tryon ... Tryon, Robert C. (Robert Choate), 1901-1967. Correlation (Statistics) Ability Testing. HA33 .T7 523.85 TRC Parts I and III each preceded by a half-title not included in te paging. Bibliography: p. 109. New York : McGraw-Hill book, c1970. c1970. 1970 Text xviii, 347 p. : ng