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Creator Personal Names
Pohlman, G. G. (George Gordon), 1902-
Remove constraint Creator Personal Names: Pohlman, G. G. (George Gordon), 1902-
All Subjects
Soil acidity--Research.
Remove constraint All Subjects: Soil acidity--Research.
Subject Topical
Hydrogen-ion concentration.
Remove constraint Subject Topical: Hydrogen-ion concentration.
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