Tài nguyên được gắn thẻ với: Droughts
2 đề mục được tìm thấy (Hiển thị 1 - 2)
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Tài Nguyên Chính 01-01-1999 This book looks at the ways in which the productivity of food crops in the semi-arid tropics may be increased, and yields safeguarded, by both genetic and agronomic means. 2 Copies.
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The story of Canada's conquest of the prairie droughtduring the Dust Bowl years of the 1930s.