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Subject (Genre)
- Observations31
- Congresses9
- Legislative hearings7
- Photographs from space7
- Conference papers and proceedings4
- Periodicals4
- Rules and practice4
- Bibliography3
- Juvenile literature2
- Rocket observations2
- Charts, diagrams, etc1
- Electronic books1
- Handbooks, manuals, etc1
- Internet resources1
- Models (Representations)1
- Pictorial works1
- Radiosonde observations1