Genre
- Periodicals 100 canlyniadau
- Statistics 63 canlyniadau
- Congresses 9 canlyniadau
- Bibliography 3 canlyniadau
- Anecdotes 1 canlyniadau
- Biography 1 canlyniadau
- Case studies 1 canlyniadau
- Census, 2000 1 canlyniadau
- Handbooks, manuals, etc 1 canlyniadau
- Periodials 1 canlyniadau
- Registers 1 canlyniadau
- Surveys 1 canlyniadau