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![](./images/clear.gif) 1.- COMPARATIVE PETROGRAPHIC AND GEOCHEMICAL STUDY OF THE PUERTOLLANO OIL SHALE KEROGENS
PERGAMON; OXFORD-NEW YORK; III; INTERNATIONAL, 1996
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![](./images/clear.gif) 2.- ORGANIC MATTER OF THE PUERTOLLANO OIL SHALES; MATURATION AND PALAEOENVIRONMENTAL CONDITIONS
WYDAWNICTWA GEOLOGICZNE; WARSAW; POL; POLAND, 1997
PROCEEDINGS OF THE XIII INTERNATIONAL CONGRESS ON THE CARBONIFEROUS AND PERMIAN
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