Richard J. Butler

Richard J. Butler

Bob Walters with Kevin Padian, David Dilkes, Xing Xu, Thomas R. Holtz, Daniel J. Chure, James I. Kirkland, J. Michael Parrish, Matthew T. Carrano, Edwin H. Colbert, Lawrence M. Witmer, Art Andersen, Jack Horner, Peter M. Galton, David D. Gillette, Mark Marshall, Richard J. Butler, Casey M. Holliday, James O. Farlow, Willem J. Hillenius, Douglas Henderson, Paul M. Barrett, Mary H. Schweitzer, Terry D. Jones, Amy E. Harwell, Jeffrey A. Wilson, Darla K. Zelenitsky, John R. Hutchinson, Hugh Torrens, Darren Naish, Emily Buchholtz, John Ruben, Elizabeth K. Burton, Gregory S. Paul, Adam M. Yates, Michael J. Benton, Peter J. Makovicky, Michael K. Brett-Surman, Kristina Curry Rogers, Brent H. Breithaupt, Bruce H. Tiffney, Hans-Dieter Sues, Donald M. Henderson, Nicholas Fraser, Kenneth Carpenter, Nicholas R. Geist, Devon E. Quick, Karen Chin, R.E.H. Reid, Kenneth J. McNamara, Ralph E. Chapman, William A. S. Sarjeant, Ralph E. Molnar, J. David Archibald, John Long, Neffra Matthews, David A.E. Spalding, David W. E. Hone, Elizabeth Rega, Corwin Sullivan