@article{ref1,
title="Motor Transportation in the United States--Discussion",
journal="American economic review",
year="1927",
author="Miller, Sidney L. and Marx, Robert S. and Brosseau, A. J. and Ruggles, C. O. and Trumbower, Henry R. and Gray, Horace M.",
volume="17",
number="1",
pages="157-176",
abstract="<p>[Abstract unavailable]</p>",
language="",
issn="0002-8282",
doi="",
url="http://dx.doi.org/"
}