File:Wtc7-nist1a-fig3-15.jpg
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Wtc7-nist1a-fig3-15.jpg (412 × 281 pixels, file size: 34 KB, MIME type: image/jpeg)
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Date/Time | Thumbnail | Dimensions | User | Comment | |
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current | 05:19, 23 April 2009 | 412 × 281 (34 KB) | Johninwiki | {{Information |Description={{en|1=Downward velocity of north face roofline as WTC7 began to collapse}} |Source=http://wtc.nist.gov/NCSTAR1/PDF/NCSTAR%201A.pdf |Author=National Institute of Standards and Technology |Date=2008-11-20 |Permission={{PD-USGov-N |
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