تفاصيل المصادر
إرشادات عامة من مصادر أولية. لا تتحقق هذه المراجع من الظروف المحلية، ولا تمنح اعتمادًا لمنتج، ولا تحل محل تقييم مؤهل.
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- University of Maryland Soil Sampling for Optimizing Agricultural Production in Maryland FS1184
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- PROV Primer: a primer for the PROV provenance data model