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Periodical

50, 100 & 150 YEARS AGO.

Source: Scientific American. Sep2009, Vol. 301 Issue 3, p12-12. 1p.

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Periodical

Blurring the Cosmic Snapshot.

Authors : Musser, George

Source: Scientific American. May2009, Vol. 300 Issue 5, p24-24. 1/4p.

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