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Comets in the Post-Halley Era In Part Based on Reviews Presented at the 121st Colloquium of the International Astronomical Union, Held in Bamberg, Germany, April 24-28, 1989
- "Comets in the Post-Halley Era In Part Based on Reviews Presented at the 121st Colloquium of the International Astronomical Union, Held in Bamberg, Germany, April 24-28, 1989"