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G. W. Ivens

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East African Weeds and Their Control
West African Weeds
U. K. Pesticide Guide, 1994
U. K. Pesticide Guide, 1992
The UK Pesticide Guide, 1991
The UK Pesticide Guide, 1990
East African weeds and their control.
West African weeds
Plant Protection in the Garden
The U. K. Pesticide Guide