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h a elwell
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Natural pest & disease control
H. A. Elwell · Natural Farming Network with assistance from the Plant Protection Improvement Programme
128 sayfa · 1995
Control / Garden pests / Pests / Plant diseases
Erosion and sediment yield
R. F. Hadley, D. E. Walling, H. A. Elwell · Geo Books
218 sayfa · 1984
Bed load / Sediments (Geology) / Soil erosion / Erosion / Sediment transport
Soil survey of Lac Qui Parle County, Minnesota
J. Ambrose Elwell, Geoffrey Baldwin Bodman, E. A. Fieger, J. S. Hall, C. H. Hammer, P. R. McMiller, Harvey Theodore Petraborg, Reuben Marion Pinckney, W. W. Strike · U.S. Govt. Print. Off.
48 sayfa · 1929
Soil surveys / Soils