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What size of shells were these forts designed to withstand? How thick was their concrete, etc.?-- Sturmvogel 66 ( talk) 00:08, 15 November 2010 (UTC)
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What size of shells were these forts designed to withstand? How thick was their concrete, etc.?-- Sturmvogel 66 ( talk) 00:08, 15 November 2010 (UTC)