राष्ट्रीय डाक संग्रहालय - Free Audio Guide

वाशिंगटन डी.सी., संयुक्त राज्य अमेरिका

National Postal Museum, 2, Massachusetts Avenue Northeast, NoMa, Ward 6, Washington, District of Columbia, 20002, United States

National Postal Museum, Washington, D.C.

Midwest1.9, CC BY-SA 4.0, via Wikimedia Commons

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