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- 77015158 abstract "Gives directions for making several time-keeping devices such as a sundial and water clock and discusses some ancient knowledge about measuring time.".
- 77015158 contributor B3033598.
- 77015158 contributor B3033599.
- 77015158 created "c1980.".
- 77015158 date "1980".
- 77015158 date "c1980.".
- 77015158 dateCopyrighted "c1980.".
- 77015158 description "Bibliography: p. 79.".
- 77015158 description "Gives directions for making several time-keeping devices such as a sundial and water clock and discusses some ancient knowledge about measuring time.".
- 77015158 extent "79 p. :".
- 77015158 identifier "0385132158 :".
- 77015158 identifier "0385132166 (lib. bdg.)".
- 77015158 issued "1980".
- 77015158 issued "c1980.".
- 77015158 language "eng".
- 77015158 publisher "Garden City, N.Y. : Doubleday,".
- 77015158 subject "529 19".
- 77015158 subject "QB209.5 .H85".
- 77015158 subject "Time Juvenile literature.".
- 77015158 subject "Time measurements Juvenile literature.".
- 77015158 subject "Time measurements.".
- 77015158 subject "Time.".
- 77015158 title "When is now? : Experiments with time and timekeeping devices / by Henry Humphrey and Deirdre O'Meara-Humphrey.".
- 77015158 type "text".