Pynciau a Argymhellir O fewn eich chwiliad
Pynciau a Argymhellir O fewn eich chwiliad
Agriculture
70
History
65
Soils
41
Forests and forestry
39
Research
24
Soil surveys
22
Control
21
rhagor ...
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
gan Davis, Richard Harding, 1864-1916
1887
1887
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10
1879
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11
1790
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12
1906
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13
gan Starkey, William Paul
1937
1937
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14
gan Coppée, Henry, 1821-1895
1866
1866
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15
gan Bassler, Harvey, 1883-1950
1929
1929
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16
1965
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17
gan Jacoby, Henry Sylvester, 1857-1955
1872
1872
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18
gan Forstall, Edward Logan, d. 1989
1917
1917
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19
1854
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20
gan Fritz, John, 1822-1913
1910
1910
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