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Subject (Genre)
- Internet videos389
- Educational films326
- Maps168
- Periodicals67
- Dictionaries35
- Bibliography32
- Early works to 180030
- Congresses28
- Physical maps28
- History22
- Science television programs21
- Documentary television programs20
- Textbooks20
- Atlases19
- Statistics13
- Electronic books12
- World atlases12
- Nature television programs11
- Remote-sensing images11
- Pictorial works10