5. <The> background of ecology

Author:

Library: Library of Faculty of Natural Resources (Alborz)

Subject: Ecology

Classification :
QK
495
.
A12
,
M47
1979

6. The background of ecology :

Author:

Library: Center and Library of Islamic Studies in European Languages (Qom)

Subject: Ecology

Classification :
QH541
.
M386
1986

7. The background of ecology: concept and theory

Author:

Library: Central Library and Documents Center of Al-Zahra University (Tehran)

Subject: ، Ecology

Classification :
QH
541
.
M35
1985

8. Tourism

Author:

Library: Central Library and Documents Center of Tehran University (Tehran)

Subject: Tourism

Classification :
G
155
.
A1G6
1999

9. Tourism principles, practices, and philosophies

Author:

Library: Central Library and Documents Center of Allameh Tabatabaei University (Tehran)

Classification :
G155
،.
T84
,
M2