What Spaceguard did.
Harris
Alan
A
Space Science Institute, 4603 Orange Knoll Avenue, La Canada, California 91011-3364, USA.
D018534:Earth, Planet; D004784:Environmental Monitoring / Q000266:history / Q000706:statistics & numerical data; D049673:History, 20th Century; D049674:History, 21st Century; D019110:Meteoroids; D014481:United States; D018557:United States National Aeronautics and Space Administration