1. Biological conservation
Author: Ehrenfeld, David W.
Library: Central Library and Information Center of Ferdowsi University of Mashhad (Khorasan Razavi)
Subject: ، Nature conservation,، Wildlife conservation,، Pollution
Classification :
QH
75
.
E35
2. Conserving life on earth
Author: / David W. Ehrenfeld
Library: Central Library and Archive Center of shahid Beheshti University (Tehran)
Subject: Nature conservation,Ecology
Classification :
639
.
9
Eh-C
