The standard guide . is a low aperture 2 feetsquare gives access throughanother wall 5 feet deep, into, „ , , , 0^1 . /i»f, „,„,He an innermost vault or cham-
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Rectified photographic exterior elevations of the left bastion casemates, Fort Cumberland (MP/FOC0206) Archive Item - English Heritage(EH):Archive Collection | Historic England
File:Fort Adams, Newport Neck, Newport, Newport County, RI HABS RI,3-NEWP,54- (sheet 20 of 45).png - Wikimedia Commons
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From Memory to Monument - Fort Stanwix National Monument (U.S. National Park Service)
Fort Independence, Castle Island, S. Boston - Digital Commonwealth
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Montagu Bastion
Front II and Bastion B (U.S. National Park Service)
Military Architecture Excursions into Architecture Quentin Hughes HC Book | eBay
Casemate - Wikipedia
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Case 3 - UM Clements Library
King's Bastion including one 12.5–38 ton Gun and two 10in–18 ton Guns
Case 3 - UM Clements Library
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