1. Division of Paleontology; American Museum of Natural History; Central Park West at 79th Street, New York New York 10024
2. Department of Geology and Geography; West Virginia University; 98 Beechurst Avenue, Brooks Hall, Morgantown West Virginia 26506
3. Paleontological Institute and Department of Geology; University of Kansas; 1475 Jayhawk Boulevard Lawrence Kansas 66045
4. Natural History Museum; Cromwell Road London SW7 5BD United Kingdom