Restored archive. The original History Commons is no longer online; this is a read-only edition of its timelines. Content is licensed CC BY-NC-SA.

History Commons Archive

Restored archive of the open-content investigative journalism project

Roger Clark

Profile: Roger Clark

Events (4)

September 12, 2001: US Geological Survey and NASA Discuss Scanning Ground Zero Dust to Determine Chemical Composition 2001-09-12
September 13, 2001: US Geological Survey and NASA Agree on Aerial Examination of Ground Zero Dust 2001-09-13
September 17, 2001-September 19, 2001-: US Geological Survey Collects Dust Samples near Ground Zero 2001-09-17
September 20, 2001: US Geological Survey Finds Asbestos, ‘Alphabet Soup of Heavy Metals’ in Ground Zero Dust 2001-09-20