prepared for UNEP by the GEMS Monitoring and Assessment Research Centre, London, UK in co-operation with the World Resources Institute, Washington, D.C., UK Department of the Environment, London

B. Blackwell 1993 [4th ed.] (1993/94)

Available at 31 libraries

prepared for UNEP by the GEMS Monitoring and Assessment Research Centre, London, UK in co-operation with the World Resources Institute, Washington DC, UK Department of the Environment, London

Blackwell Reference 1989 2nd ed

Available at 9 libraries

Global Environment Monitoring System ; prepared in cooperation with the Monitoring and Assessment Research Centre, Chelsea College, University of London, London, England

World Health Organization 1984

: pbk

Available at 11 libraries