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Soils
95
Soil surveys
85
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63
Études pédologiques
40
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25
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by Hiester, Gabriel
[Harrisburg, Pa.] : Wm. Stanley Ray, State Printer of Pennsylvania, 1902
[Harrisburg, Pa.] : Wm. Stanley Ray, State Printer of Pennsylvania, 1902
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6
by Gress, Ernest Milton, 1876-1968
Harrisburg [Pa.] : Pennsylvania Dept. of Agriculture, 1925
Harrisburg [Pa.] : Pennsylvania Dept. of Agriculture, 1925
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8
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by Kunkle, W. Merrill, 1904-1986
[Washington, D.C. : U.S. Soil Conservation Service,] 1966
[Washington, D.C. : U.S. Soil Conservation Service,] 1966
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10
11
Harrisburg, Pa. : Pennsylvania Game Commission, 1940
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12
13
14
by Hersh, Donald Mench, 1917-
[Washington] : U.S. Dept. of Agriculture, Soil Conservation Service, 1963
[Washington] : U.S. Dept. of Agriculture, Soil Conservation Service, 1963
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15
by Speir, Reginald, 1920-
[Washington] : U.S. Soil Conservation Service : [for sale by the Supt. of Docs., U.S. Govt. Print. Off.], 1967
[Washington] : U.S. Soil Conservation Service : [for sale by the Supt. of Docs., U.S. Govt. Print. Off.], 1967
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16
17
Harrisburg, Pa. : Pennsylvania Dept. of Forestry, 1916
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18
19
20
[Washington, D.C.] : U.S. Dept. of Agriculture, Farm Service Agency, 2003
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