VALK, W. - Sedimentpetrologie van het Perm en de Trias in den ondergrond van Nederland.

1945. Geologisch Bureau voor het Mijngebied te Heerlen, meded. bij Lrversl. 1942-43; 17 pp. 1 fig. 1 fold-out table. Orig. extract, stapled, sm4to.

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