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field research on regional ecosystems

·Pakistan: 2000, 2001, 2004, 2006, 2007.

·United Arab Emirates & Oman: 2003, 2004, 2005, 2006, 2007.

·Bangladesh: 2000.

·Brunei & Philippines: 1994.

·China: 1991, 1993.

·Sahel of West Africa: Mali, Niger, Burkina Faso & Cameroon 1984 to 1986.

·Yemen 1984.

·Indonesia 1982, 1986, 1987 to 1991.

·California 1978 to 1983, 1998.

·British Columbia 1974 to 1982, 1989 to present.