Maps. Grand Canyon National Monument. Topographic map of Grand Canyon National Monument, Ariz., topography by C. H. Birdseye, R. W. Burchard, R. T. Evans, K. R. Monbeck, E. S. Rickard, V. S. Seward, E. J. Matson, W. L. Thomas, and R. C. Harding, surveyed in 1934-36; [map]. Scale 1:48,000, contour interval 50 ft. n. p.