what we've learned Vogt, Gregory. creator text bibliography nyu New York Franklin Watts 1987 monographic eng

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95 p. : ill. (some col.) ; 23 cm. Describes the discovery of Halley's comet and the research carried out around the world when the comet returned in 1986. juvenile Gregory Vogt. Includes index. Bibliography: p. 91-92. Comets Halley's comet Juvenile literature Halley's comet QB723.H2 V64 1987 523.6/4 0531103048 (lib. bdg.) 87010402 DLC 080603 20190501200352.0