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African Journal of Range and Forage Science -- Vol. 9 No. 1 (1974): The influence of nitrate and ammonia nitrogen on the photosynthetic and photorespiratory activity of selected highveld grasses exhibiting C-4 photosynthesis | 27 USD |
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South African Journal of Higher Education -- Vol. 18 No. 3 (2004): Mainstreaming African Indigenous Knowledge Systems in higher and tertiary education: The case of Zimbabwe | 27 USD |
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| Total: 54 USD | |||
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