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Pacific Fortress: A History of the Seacoast Defenses of Hawaii: Williford, Glen M, Berhow, Mark a, McGovern, Terrance C: 9781732391659: Amazon.com: Books
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Batteries at Fort Hunt and WWII Strategic Interrogation Center (P.O. Box 1142) - Clio
12-inch gun M1895 - Wikipedia
Federal battery with 13-inch seacoast mortars, Model 1861, during the Siege of Yorktown, Virginia (1862). [3024x2530] : r/MilitaryPorn
Seacoast defense in the United States - Wikipedia
Battery 120 - FortWiki Historic U.S. and Canadian Forts
Seacoast defense in the United States - Wikipedia
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List of coastal fortifications of the United States - Wikipedia
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HyprWar: "Condition Red: Marine Defense Battalions in World War II"
Battery 122 - FortWiki Historic U.S. and Canadian Forts
Yorktown, Virginia. 13-inch seacoast mortars of Federal Battery No. 4 - LOC's Public Domain Archive Public Domain Search