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1
Desertification : January 1985-September 1992 /
by Singer, Carol A.
Beltsville, Md. : National Agricultural Library, 1992

Government Document Book
2
Effects of carbon dioxide enrichment on plant growth : January 1989 - August 1992 /
by Singer, Carol A.
Beltsville, Md. : National Agricultural Library, 1992

Government Document Book
3
Population growth and food supply, January 1979 - April 1993 /
by Singer, Carol A.
Beltsville, Md. : National Agricultural Library, 1993

Government Document Book
4
Forests and climate change : January 1979-May 1994 /
by Singer, Carol A.
Beltsville, Md. : National Agricultural Library, 1994

Government Document Book
5
Farming in arid and semiarid lands : January 1979-May 1994 /
by Singer, Carol A.
Beltsville, Md. : National Agricultural Library, 1994

Government Document Book
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