אתרים דומים sciencedaily.com:
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519,564

academia.edu 
498,002

nature.com 
436,775

medscape.com 
290,063

vt.edu 
247,593

thermofisher.com 
164,651

uoguelph.ca 
150,488

astro.com 
142,769

nap.edu 
108,952

cafeastrology.com 
106,523

science.gov 
47,509

eurekalert.org 
47,262

york.cuny.edu 
34,926

bzu.edu.pk 
32,080

healthboards.com 
31,066

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