PERMANENT FORTIFICATIONS (MILITARY ENGINEERING)
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BTFORTIFICATIONS (MILITARY ENGINEERING)
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UDC623,022.11
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Descriptor GERDAUERBEFESTIGUNGEN (WEHRTECHNOLOGIE)
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Descriptor ENGPERMANENT FORTIFICATIONS (MILITARY ENGINEERING)
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Descriptor FREFORTIFICATIONS PERMANENTES (GÉNIE MILITAIRE)
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Variant GERBEFESTIGUNGEN/DAUERBEFESTIGUNGEN (WEHRTECHNOLOGIE)
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Variant ENGFORTIFICATIONS/PERMANENT FORTIFICATIONS (MILITARY ENGINEERING)
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NTFORTIFIED LINES (MILITARY ENGINEERING)
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NTDETAILS OF FORTRESSES AND PERMANENT FORTIFICATIONS (MILITARY ENGINEERING)
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NTFORTRESSES (MILITARY ENGINEERING)