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Opencast Mining. Nature 181, 889 (1958). https://doi.org/10.1038/181889a0
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DOI: https://doi.org/10.1038/181889a0
Nature volume 181, page 889 (1958)
Opencast Mining. Nature 181, 889 (1958). https://doi.org/10.1038/181889a0
Issue Date:
DOI: https://doi.org/10.1038/181889a0