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Image of the World Trade Center taken on 9/12/01 approximately 10:30 am by Landsat 7 flying 438 miles up.  (Processed and archived at USGS EROS Data Center, Sioux Falls, SD.)
Image of the World Trade Center taken on 9/12/01 approximately 10:30 am by Landsat 7 flying 438 miles up. (Processed and archived at USGS EROS Data Center, Sioux Falls, SD.)
Image of the World Trade Center taken on 9/8/02 by Landsat 7 flying 438 miles up.  (Processed and archived at USGS EROS Data Center, Sioux Falls, SD.)
Image of the World Trade Center taken on 9/8/02 by Landsat 7 flying 438 miles up. (Processed and archived at USGS EROS Data Center, Sioux Falls, SD.)
Side by side comparison image of the World Trade Center taken on 9/12/01 and 9/8/02 by Landsat 7 flying 438 miles up.  (Processed and archived at USGS EROS Data Center, Sioux Falls, SD)
Side by side comparison image of the World Trade Center taken on 9/12/01 and 9/8/02 by Landsat 7 flying 438 miles up. (Processed and archived at USGS EROS Data Center, Sioux Falls, SD)
Smoke streaming from Ground Zero illuminates the night skyline of lower Manhattan in a view looking east from New Jersey. Photo taken the night of Sept. 16, 2001, by USGS field-crew members Todd Hoefen and Gregg Swayze.
Smoke streaming from Ground Zero illuminates the night skyline of lower Manhattan in a view looking east from New Jersey. Photo taken the night of Sept. 16, 2001, by USGS field-crew members Todd Hoefen and Gregg Swayze.
Image of Todd Hoefen making a spectral measurement of World Trade Center sampls WTC01-14. The sample is in a fumehood. (278 KBytes)
Image of Todd Hoefen making a spectral measurement of World Trade Center sampls WTC01-14.
Closeup of sample WTC01-14 being measured with a spectrometer. The black cord with the steel tip is the fiber-optic probe of the spectrometer. (166 KBytes)
Closeup of sample WTC01-14 being measured with a spectrometer. The black cord with the steel tip is the fiber-optic probe of the spectrometer.

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