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| HTML version | PDF version* |
| Bulletin Nº 1. April 1997 | DURGB1.pdf |
| Bulletin Nº 2. September 1997 | DURGB2.pdf |
| Bulletin Nº 3. January 1998 | DURGB3.pdf |
| Bulletin Nº 4. May 1998 | DURGB4.pdf |
| Bulletin Nº 5. June 1998 | DURGB5.pdf |
| Bulletin Nº 6. December 1998 | DURGB6.pdf |
| Bulletin Nº 7. April 1999 | DURGB7.pdf |
| Bulletin Nº 8. January 2000 | DURGB8.pdf |
| Bulletin n° 9. July 2000 | DURGB9.pdf |
| Bulletin n° 10. November 2000 | DURGB10.pdf |
| Bulletin n° 11. february 2002 | DURGB11.pdf |
| Bulletin n° 12. february 2003 | DURGB12.pdf |
| Bulletin n° 13. february 2004 | DURGB13.pdf |
| Bulletin n° 14. january 2005 | DURGB14.pdf |
| Bulletin n° 15. january 2006 | DURGB15.pdf |
| Bulletin Nº 16. january 2007 | DURGB16.pdf |
| Bulletin n° 17. january 2008 | DURGB17.pdf |
| Bulletin n° 18. june 2008 | DURGB18.pdf |
| Bulletin n° 19. january 2009 | DURGB19.pdf |
| Bulletin n° 20. january 2010 | DURGB20.pdf |
| Bulletin n° 20. january 2011 | DURGB21.pdf |
| Bulletin n° 22. january 2012 | DURGB22.pdf |
