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1
Published 1981
Springer Netherlands
Table of Contents: “...The Nature of Comets -- Comet Nucleus: Some Characteristics and a Hypothesis on Origin...”
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2
by Ward, Peter D.
Published 1997
Copernicus
“... of mass extinctions throughout earth's history, including the great comet crash that killed off...”
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3
Published 1981
Springer Netherlands
Table of Contents: “... of Organic Molecules in Interstellar Space and Some of its Consequences -- Comets and the Origin of Life...”