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Nigerian Journal of Soil Science -- Vol. 15 (2005): Effect of poultry manure, NPK 15-15-15 and combination of their reduced levels on maize growth and soil chemical properties | 27 USD |
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Journal of Civil Engineering Research and Practice -- Vol. 8 No. 1 (2011): Assessment of Pumice Blocks in Comparison to Cement Sand Blocks and Burnt Blocks ‘The Case of Mbeya City - Tanzania’ | 27 USD |
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| Total: 54 USD | |||
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