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[St. Paul, Minn.] : North Central Forest Experiment Station, U.S. Dept. of Agriculture, Forest Service, 1968

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2
par Mitchell, John W. (John William), 1905-
Washington, D.C. : U.S. Dept. of Agriculture, 1958

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3

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4
par Baker, David G., 1956-
Washington, D.C. : ASM Press, 2003

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5
Boulder : Westview Press, 1991

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București : Ministerul Educației și Învățămîntului, Institutul Agronomic "Nicolae Bălcescu", 1974

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8
par Dowswell, Christopher R.
Boulder : Westview Press, 1996

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9
par Amanor, Kojo, 1956-
London : Agricultural Administration Unit, Overseas Development Institute, 1989

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10
Madison, Wis. : American Society of Agronomy : Crop Science Society of America : Soil Science Society of America, 1997

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12
par Adewale, Adekunle A., Fatunbi, Oluwole, Bafana, Busani, Babaleye, Taye, Akinbamijo, 'Yemi
Accra, Ghana : FARA, Forum for Agricultural Research in Africa, 2014

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13
[Washington, D.C.?] : U.S. Dept. of Commerce, National Oceanic and Atmospheric Administration, 1986

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14
Madison, Wis., USA : Crop Science Society of America : American Society of Agronomy, 1989

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15
par Kean, Stuart A.
The Hague, Netherlands : International Service for National Agricultural Research, 1988

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16
par Cruz, Wilfrido
Bangkok : Winrock International, 1988

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17
Boulder : Westview Press, 1986

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18
par Soliz V., Rómulo, 1946-
The Hague, Netherlands : International Service for National Agricultural Research, 1989

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19
Hague, Netherlands : ISNAR, International Service for National Agricultural Research : Southern African Centre for Cooperation in Agricultural Research, 1990

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20
Ithaca : Cornell University Press, 1992

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