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Your search for [author]Gruhn, P. returned 4 records. |
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Integrated nutrient management, soil fertility and sustainable agriculture: current issues and future challenges.
by Gruhn, P.; Washington: IFPRI.
Subject: Plant nutrients; Soil management and nutrients.
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The modern junior high school.
by Gruhn, William Theodore; New York: Ronald Press Co., 1947.
Subject: Junior high schools.
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Student teaching in the elementary school.
by Lindsey, Margaret; New York: Ronald Press, 1957.
Subject: Student teaching.
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Principles and practices of secondary education.
by Anderson, Vernon Ellsworth, 1908-; New York: Ronald Press, 1962.
Subject: Education, Secondary.
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