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Google
Rank	Domain	PR	Backlinks	Pages in URL
1	nasa.gov	9	4910000	35900000
2	history.nasa.gov	7	47700	16700
4	scribd.com	7	1110000	9600000
6	siris-archives.si.edu	5	2680	192000
7	amazon.com	8	104000000	75800000
8	afhra.af.mil
9	nationmaster.com	7	247000	6100000
10	dfrc.nasa.gov	7	26800	13200
12	dmoz.org	8	6510000	1820000
13	google.com	1-	423000000	36800000

Yahoo
Rank	Domain	PR	Backlinks	Pages in URL
1	nasa.gov	9	4910000	35900000
2	dfrc.nasa.gov	7	26800	13200
3	ntrs.nasa.gov	7	30200	2250000
4	oea.larc.nasa.gov	7	1910	635
5	history.nasa.gov	7	47700	16700
6	employeeorientation.nasa.gov	6	178	546
7	arcadiapublishing.com	6	9450	14900
8	hq.nasa.gov	7	429000	23500
10	jlab.org	-
11	www1.nasa.gov	6	52500	2220

Bing
Rank	Domain	PR	Backlinks	Pages in URL
1	dfrc.nasa.gov	7	26800	13200
3	scribd.com	7	1110000	9600000
4	search.nasa.gov	5	31100	5950
5	history.nasa.gov	7	47700	16700
6	oea.larc.nasa.gov	7	1910	635
7	arcadiapublishing.com	6	9450	14900
8	nasa.gov	9	4910000	35900000
9	ntrs.nasa.gov	7	30200	2250000
10	naca.larc.nasa.gov	7	1560	125000
14	hq.nasa.gov	7	429000	23500

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