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Humic acids from coals of the North-Bohemian coal field: I. Preparation and characterisation

✍ Scribed by Jaromı́r Novák; Josef Kozler; Pavel Janoš; Jiřina Čežı́ková; Věnceslava Tokarová; Libuše Madronová

No coin nor oath required. For personal study only.

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