Gopal, Brij .
Elements of ecology / by Brij Gopal and N. Bhardwaj. - New Delhi : Vikas Publishing House , 1979 - vi, 200 p. :
0 7069 0754 X
Ecosystems
I:5 / L9
Elements of ecology / by Brij Gopal and N. Bhardwaj. - New Delhi : Vikas Publishing House , 1979 - vi, 200 p. :
0 7069 0754 X
Ecosystems
I:5 / L9