| Title: | Экология |
| Subtitle: | |
| Nationality: | Русия |
| ISSN: | 0367-0597 |
| UDC: | 502 |
| Note: |
| `P.K. Yavorov` Public Library - | Bourgas - | 2004 |
| `Prof. A. Zlatarov` University - | Bourgas - | 2002 |
| `K. Preslavski` Shoumen University - | Shoumen - | 1998 |
| `K. Preslavski` Shoumen University - | Shoumen - | 1999 |
| `K. Preslavski` Shoumen University - | Shoumen - | 2000 |
| `K. Preslavski` Shoumen University - | Shoumen - | 2001 |
| `K. Preslavski` Shoumen University - | Shoumen - | 2003 |
| `K. Preslavski` Shoumen University - | Shoumen - | 2004 |
| `K. Preslavski` Shoumen University - | Shoumen - | 2005 |
| `K. Preslavski` Shoumen University - | Shoumen - | 2006 |
| `K. Preslavski` Shoumen University - | Shoumen - | 2007 |
| `K. Preslavski` Shoumen University - | Shoumen - | 2008 |
| `K. Preslavski` Shoumen University - | Shoumen - | 2009 |
| `K. Preslavski` Shoumen University - | Shoumen - | 2010 |
| `K. Preslavski` Shoumen University - | Shoumen - | 2011 |
| `K. Preslavski` Shoumen University - | Shoumen - | 2012 |
| `K. Preslavski` Shoumen University - | Shoumen - | 2015 |
| Technical University - | Varna - | 1998 |
| Technical University - | Varna - | 2000 |
| Varna Free University - | Varna - | 1998 |
| Varna Free University - | Varna - | 1999 |
| Varna Free University - | Varna - | 2000 |
| Varna Free University - | Varna - | 2002 |
| Varna Free University - | Varna - | 2003 |
| Varna Free University - | Varna - | 2004 |
| Varna Free University - | Varna - | 2005 |
| Varna Free University - | Varna - | 2006 |
| Varna Free University - | Varna - | 2008 |
| Varna Free University - | Varna - | 2009 |
| Varna Free University - | Varna - | 2010 |
| Varna Free University - | Varna - | 2011 |
| Varna Free University - | Varna - | 2012 |
| Varna Free University - | Varna - | 2013 |
| `P. Slavejkov` Public Library - | Varna - | 2001 |
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