Elementary statistics for geographers / James E. Burt, Gerald M. Barber, David L. Rigby. Burt, James E. Barber, Gerald M. Rigby, David L. Geography Statistical methods. G70.3 .B37 2009 519.502491 22 BUE Includes bibliographical references and index. New York : Guilford Press, c2009. c2009. 2009 Text xii, 653 p. : eng