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City walls --- Fortification, Roman --- Rome --- Military antiquities --- -Fortification, Roman --- -Infrared radiation --- -Microwaves --- -Hertzian waves --- Electric waves --- Electromagnetic waves --- Geomagnetic micropulsations --- Radio waves --- Shortwave radio --- Infra-red rays --- Infrared rays --- Radiation, Infrared --- Rays, Infrared --- Roman fortification --- Architecture, Roman --- Classical antiquities --- Village walls --- Fortification --- Walls --- Congresses --- Military applications --- -Congresses --- -Congresses. --- Congresses. --- Rim --- Roman Empire --- Roman Republic (510-30 B.C.) --- Romi (Empire) --- Byzantine Empire --- Rome (Italy) --- -Village walls --- Hertzian waves --- City walls - Rome - Congresses --- Fortification, Roman - Congresses --- Rome - Military antiquities - Congresses