Encyclopaedia of environmental analysis- 3 vol.
G R Chhatwal
Encyclopaedia of environmental analysis- 3 vol. - New Delhi Anmol publications 1997
363.7003 / ENC.E.1-3
Encyclopaedia of environmental analysis- 3 vol. - New Delhi Anmol publications 1997
363.7003 / ENC.E.1-3