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Google
Rank	Domain	PR	Backlinks	Pages in URL
1	en.wikipedia.org	8	61800000	3750000
3	nap.edu	8	323000	865000
5	spacegrant.oregonstate.edu	6	875	146
6	education.gsfc.nasa.gov	7	1570	703
7	pdf-search-engine.com	5	13800	245000
8	books.nap.edu	6	80900	382000
10	saloits.com	4	14	13
11	ag.iastate.edu	6	34400	7400
12	waspacegrant.org	6	897	330
13	education.ssc.nasa.gov	6	315	41

Yahoo
Rank	Domain	PR	Backlinks	Pages in URL
1	en.wikipedia.org	8	61800000	3750000
2	spaceflight.nasa.gov	7	192000	57100
5	apu.edu	7	21400	46300
6	ocolly.com	3	9700	18800
7	geocities.com	9	21200000	10200000
8	history.nasa.gov	7	47700	16700
9	spaceprogramarchive.com	3	94	54
10	michiganpress.org	4	556	484
11	cce.nasa.gov	5	63	1100
12	rand.org	8	190000	119000

Bing
Rank	Domain	PR	Backlinks	Pages in URL
1	nap.edu	8	323000	865000
2	ssc.nasa.gov	7	7710	1920
3	clarkplanetarium.org	6	1930	240
5	hillsdalehigh.com	5	129	277
6	philaedfund.org	5	694	759
8	belden.com	6	14400	5780
9	geocities.com	9	21200000	10200000
10	spaceflight.nasa.gov	7	192000	57100
11	californiaspaceauthority.org	-
12	books.nap.edu	6	80900	382000

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