Genre
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- Case studies 34 canlyniadau
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- Congresses 28 canlyniadau
- Handbooks, manuals, etc 22 canlyniadau
- Biography 6 canlyniadau
- History 6 canlyniadau
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- Census, 2000 2 canlyniadau
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- Electronic book 2 canlyniadau
- Festschriften 2 canlyniadau
- Longitudinal studies 2 canlyniadau
- Self-instruction 2 canlyniadau
- Statistics 2 canlyniadau
- Terminology 2 canlyniadau
- Textbooks 2 canlyniadau