FORTIFICATIONS (MILITARY ENGINEERING)
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BTFIELD ENGINEERING, FORTIFICATIONS, DEFENCE WORKS (MILITARY ENGINEERING)
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UDC623,022.1
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Descriptor GERBEFESTIGUNGEN (WEHRTECHNOLOGIE)
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Descriptor ENGFORTIFICATIONS (MILITARY ENGINEERING)
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Descriptor FREFORTIFICATIONS (GÉNIE MILITAIRE)
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NTPERMANENT FORTIFICATIONS (MILITARY ENGINEERING)
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NTFIELD FORTIFICATIONS (MILITARY ENGINEERING)