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MacDonald, Thomas A., and A. E. Demarary. "Parkways of the Future: A Radio Discussion between Mr. MacDonald, Chief of the United States Bureau of Public Roads and Mr. Demaray, Associate Director of the National Park Service." In Parkways: A Manual of the Revised Requirements, Instructions and Information Relating to National Parkways for Use in the National Park Service. Washington, D.C.: Department of the Interior, National Park Service , 1938.