New USPS stamp depicts St. Augustine's Castillo de San Marcos

Florida: Castillo de San Marcos National Monument (U.S. National Park Service)

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V S Kemanis Archives - Author V.S. Kemanis

Dr. Bronson's St. Augustine History

Castillo de San Marcos National Monument - Shop Americas National Parks

5554 - 2021 $7.95 Castillo de San Marcos, Priority Mail - Mystic Stamp Company

5554 - 2021 $7.95 Castillo de San Marcos, Priority Mail - Mystic Stamp Company

File:Aerial view of Castillo De San Marcos - 02 cropped 01.jpg - Wikipedia

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Castillo de San Marcos National Monument

First Day of Issue: St. Augustine's Quadricentennial Stamp – Governor's House Library