Authors: Babcock, R.S. --- Brown, E.H. --- Clark, M.D. --- Ford, Trevor D. --- Breed, William J.. --- et al. MacKee, Edwin D. --- Foster, Benjamin T. --- Colbert, Edwin Harris --- Huntoon, Peter W. --- Hunt, Charles B. --- Hamblin, W.K. --- Billingsley, George H.
Year: 1974 Publisher: Flagstaff Museum of Northern Arizona