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Space Exploration
註釋Designed as ready-reference tools providing key data on social concerns, these books save researchers and students from the cumbersome task of locating the various data in pamphlets, legal journals, congressional reports, newspapers and other sources. No other reference series offers such complete and up-to-date information on current social issues. The series is available as a complete set or in Issue Groups. Volumes are completely revised and updated every two years.