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001 9910702699703321
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035   $a(CKB)5470000002429187
035   $a(OCoLC)904781888
035   $a(EXLCZ)995470000002429187
100   $a20150312j201404    ua             0
101 0 $aeng
135   $aurbn|||||||||
181   $ctxt$2rdacontent
182   $cc$2rdamedia
183   $acr$2rdacarrier
200 10$aComparison of the variations of sunspot number, number of sunspot groups, and sunspot area, 1875-2013 /$fRobert M. Wilson
210  1$aHuntsville, Alabama :$cNational Aeronautics and Space Administration, Marshall Space Flight Center,$dApril 2014.
215   $a1 online resource (viii, 23 pages) $cillustrations
225 1 $aNASA/TP ;$v2014-218192
300   $aTitle from title screen (viewed March 12, 2015).
300   $a"April 2014."
320   $aIncludes bibliographical references (pages 21-23).
606   $aSunspot cycle$2nasat
606   $aSunspots$2nasat
606   $aError analysis$2nasat
606   $aMinima$2nasat
615  7$aSunspot cycle.
615  7$aSunspots.
615  7$aError analysis.
615  7$aMinima.
700   $aWilson$b Robert M.$0302787
712 02$aGeorge C. Marshall Space Flight Center,
712 02$aUnited States.$bNational Aeronautics and Space Administration,
801  0$bGPO
801  1$bGPO
906   $aBOOK
912   $a9910702699703321
996   $aComparison of the variations of sunspot number, number of sunspot groups, and sunspot area, 1875-2013$93525947
997   $aUNINA