TWINSPAN is available in souce code and as an IBM-PC executable from Multivariate Analysis on the PC-ORD System August 1993 Version Bruce McCune Department of Botany & Plant Pathology Oregon State University Cordley Hall Corvallis Oregon 97331-2902 Orders: 503-737-1733 e-mail: mccuneb at bcc.orst.edu ------- W. M. Post wmp at ornl.gov