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Subject (Genre)
- Congresses123
- Early works to 180088
- Photographs from space45
- Educational films39
- Internet videos39
- Miscellanea22
- Popular works16
- Remote-sensing images15
- Observations12
- Juvenile literature9
- Periodicals9
- Handbooks, manuals, etc8
- Maps7
- Poetry6
- Correspondence5
- Pictorial works5
- Biography4
- Drama4
- Electronic books4
- Feature films4