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100   $a20220204d1991      ua             0
101 0 $aeng
135   $aur|||||||||||
181   $ctxt$2rdacontent
182   $cc$2rdamedia
183   $acr$2rdacarrier
200 10$aGround-based observations in support of the ACTIVE satellite mission $efinal report /$fFrank T. Berkey
210  1$a[Washington, D.C.] :$c[National Aeronautics and Space Administration],$d1991.
215   $a1 online resource (ix, 102 pages) $cillustrations
225 1 $aNASA/CR ;$v190125
300   $a"1 January 1990 - 30 April 1992."
320   $aIncludes bibliographical references (pages 99-102).
517   $aGround-based observations in support of the ACTIVE satellite mission 
606   $aGravity waves$2nasat
606   $aElectrical engineering$2nasat
606   $aIonospheric propagation$2nasat
615  7$aGravity waves.
615  7$aElectrical engineering.
615  7$aIonospheric propagation.
700   $aBerkey$b Frank T.$01416726
712 02$aUnited States.$bNational Aeronautics and Space Administration,
801  0$bGPO
801  1$bGPO
801  2$bGPO
906   $aBOOK
912   $a9910717138403321
996   $aGround-based observations in support of the ACTIVE satellite mission$93522978
997   $aUNINA