1592953634000 1312632483000 term-62092 1616541187851 1312632557000 1616290176838 adlib fitz-online adlib-term-62092 553e7806-f0f2-36b9-afa4-0418979f713a 2 1 scope note Use for structures constructed wholly or mostly beneath the surface of the ground. reference term-60698 adlib-term-60698 29cf8e4d-de66-3f85-9048-ae8362cf7359 underground structure V.RK.AFU.ALO.ARI.AXC.BOK 1 code V.RK.AFU.ALO.ARI.AXC.BOK 1 underground structures reference term-60701 adlib-term-60701 3643a90a-d720-3860-9d6c-a41060169f59 <single built works by location: topographical> reference term-61629 adlib-term-61629 8b9a1967-750f-3cfe-b687-05d113446fac missile silos underground structures term