Charlton. Railroad Empire across the Heartland. University of New Mexico Press.
शिकागो शैली (17वां संस्करण) प्रशस्ति पत्रCharlton. Railroad Empire Across the Heartland. University of New Mexico Press.
एमएलए (9वां संस्करण) प्रशस्ति पत्रCharlton. Railroad Empire Across the Heartland. University of New Mexico Press.
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