Long, W. Rodney. Railways of Central America and the West Indies . Washington: Government Printing Office, 1925. Print. (HATHI TRUST digital Library
http://catalog.hathitrust.org/Record/000970279 (11 Oct. 2013))
Copyright: Public Domain, Google-digitized.
This digital book has a chapter on the railways of Puerto Rico starting on page 336.
Este libro tiene un capítulo sobre los ferrocarriles de Puerto Rico empezando en la página 336.
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