Comets, the swords of heaven

By Ritchie, David.
New York New American Library 1985 .
234 p. , "A Plume book." | Includes index. 0452256194 (pbk.)

The encyclopedia of earthquakes and volcanoes

By Ritchie, David.
New York Facts on File 1994 .
232 p. , Spine title: The encyclopedia of earthquakes & volcanoes. 29 cm..
0816026599 (hardbound : acid-free paper)

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Comets, the swords of heaven

The encyclopedia of earthquakes and volcanoes