00772nam0-22002651i-450-99000398590040332120031210174551.0000398590FED01000398590(Aleph)000398590FED0100039859020030922d--------km-y0itay50------baengRadio spectrum conservationA program of conservation based on present uses and future needsNew Yorkmcgraw-hill1952onde radiootticaJoint Technical Advisory Committee150475ITUNINARICAUNIMARCBK99000398590040332100 I13982586DETECDETECRadio spectrum conservation474144UNINA