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article
By Jeffrey Mervis
[Published 18th March 1991]



article
By Elizabeth Pennisi
[Published 18th March 1991]



article
By Jeffrey Mervis
[Published 18th March 1991]



article
By Diana Morgan
[Published 18th March 1991]



article
By Elizabeth Pennisi
[Published 18th March 1991]



article
By Arielle Emmett
[Published 18th March 1991]



article
By Robert Hazen, James Trefil
[Published 18th March 1991]



article
By Julia King
[Published 18th March 1991]



article
By Eugene Garfield
[Published 18th March 1991]



article
By Leslie Steve Rothenberg
[Published 18th March 1991]



article
By Philip Wyatt
[Published 18th March 1991]



article
By Zach Hall
[Published 18th March 1991]



article
[Published 18th March 1991]



article
By Robin Eisner
[Published 18th March 1991]



article
[Published 18th March 1991]



article
[Published 18th March 1991]



article
[Published 18th March 1991]



article
[Published 18th March 1991]



article
[Published 18th March 1991]



article
[Published 18th March 1991]



article
[Published 18th March 1991]



article
[Published 18th March 1991]



article
[Published 18th March 1991]



article
By Suzanne Hagan
[Published 18th March 1991]



article
[Published 18th March 1991]



article
By Julia King
[Published 18th March 1991]



article
By Rebecca Andrews
[Published 18th March 1991]



article
By Rebecca Andrews
[Published 18th March 1991]



article
[Published 18th March 1991]



article
By Joel Shurkin, Rebecca Andrews
[Published 18th March 1991]



article
By Jeffrey Mervis
[Published 18th March 1991]



article
[Published 18th March 1991]