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	1.	No cover image available Variation of vitrinite reflectance in a vertical seam section : An example from the Intrasudetic basin, SW Polan by Mastalerz, María Symposium: Coal: formation, occurrence and related properties ( 12-15 septembre 1989 : Orléans) Material type: Article; Format: print Language: Eng In: Bulletin de la Société géologique de France 162(2), 1991, p. 175-182: : carte, graph., tab., rés.(Fr., Angl) Availability: No items available.
	2.	No cover image available Anomalies in vitrine reflectance gradients by Murchison, Duncan Pearson, James Raymond, Anne Symposium: Coal: formation, occurrence and related properties ( 12-15 septembre 1989 : Orléans) Material type: Article; Format: print Language: Eng In: Bulletin de la Société géologique de France 162(2), 1991, p. 183-191: : ill., tab., rés.(Fr., Angl) Availability: No items available.

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