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Agriculture
70
History
65
Soils
41
Forests and forestry
39
Research
24
Soil surveys
22
Control
21
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1
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2
1908
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3
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4
1941
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5
1961
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6
1900
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7
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8
1908
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9
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10
1879
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11
1790
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12
1906
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13
由 Starkey, William Paul
1937
1937
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14
由 Coppée, Henry, 1821-1895
1866
1866
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15
由 Bassler, Harvey, 1883-1950
1929
1929
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16
1965
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17
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18
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19
1854
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20
由 Fritz, John, 1822-1913
1910
1910
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