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Subjects
Agriculture, Congresses, Nitrogen content, Nitrogen fertilizers, Soils, Agricultural chemicals, Frozen ground, Radioactive tracers in agriculture, Research, Soil fertility, Soil pollution, Soil productivity, StatisticsID Numbers
- OLID: OL682803A
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| August 26, 2008 | Edited by RenameBot | fix author name |
| April 1, 2008 | Created by an anonymous user | initial import |