✦ LIBER ✦

Groundwater Contamination with NO3-N in a Wheat-Corn Cropping System in the North China Plain

✍ Scribed by Bing-Zi ZHAO; Jia-Bao ZHANG; M. FLURY; An-Ning ZHU; Qi-Ao JIANG; Jin-Wei BI

No coin nor oath required. For personal study only.

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