The stratigraphy and structure of the Ciñera-Matallana Coalfield (prov. León, N.W. Spain)
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Wagner, R. H. (1971). The stratigraphy and structure of the Ciñera-Matallana Coalfield (prov. León, N.W. Spain). Trabajos De Geología, 4(4), 385–431. https://doi.org/10.17811/tdg.4.1971.385-431